many function in samples/subsys/settings fail with return -2

*** Booting nRF Connect SDK v3.5.99-ncs1-1 ***

*** Settings usage example ***

settings subsys initialization: OK.
subtree <alpha> handler registered: OK
subtree <alpha/beta> has static handler

##############
# iteration 0
##############

=================================================
basic load and save using registered handlers

load all key-value pairs using registered handlers
loading all settings under <beta> handler is done
loading all settings under <alpha> handler is done

save <alpha/beta/voltage> key directly: fail (err -2)
OK.

load <alpha/beta> key-value pairs using registered handlers
loading all settings under <beta> handler is done

save all key-value pairs using registered handlers

load all key-value pairs using registered handlers

=================================================
loading subtree to destination provided by the caller

  direct.length = 10071698309120
  direct.length_1 = 30340
  direct.length_2 = -3025

=================================================
Delete a key-value pair

delete <alpha/length>: fail (err -2)
  Can't to load the <alpha/length> value as expected

=================================================
Service a key-value pair without dedicated handlers

<gamma> = 0 (default)
save <gamma> key directly: fail (err -2)

##############
# iteration 1
##############

=================================================
basic load and save using registered handlers

load all key-value pairs using registered handlers
loading all settings under <beta> handler is done
loading all settings under <alpha> handler is done

save <alpha/beta/voltage> key directly: fail (err -2)
OK.

load <alpha/beta> key-value pairs using registered handlers
loading all settings under <beta> handler is done

save all key-value pairs using registered handlers

load all key-value pairs using registered handlers

=================================================
loading subtree to destination provided by the caller

  direct.length = 10071698309120
  direct.length_1 = 30340
  direct.length_2 = -3025

=================================================
Delete a key-value pair

delete <alpha/length>: fail (err -2)
  Can't to load the <alpha/length> value as expected

=================================================
Service a key-value pair without dedicated handlers

<gamma> = 0 (default)
save <gamma> key directly: fail (err -2)

##############
# iteration 2
##############

=================================================
basic load and save using registered handlers

load all key-value pairs using registered handlers
loading all settings under <beta> handler is done
loading all settings under <alpha> handler is done

save <alpha/beta/voltage> key directly: fail (err -2)
OK.

load <alpha/beta> key-value pairs using registered handlers
loading all settings under <beta> handler is done

save all key-value pairs using registered handlers

load all key-value pairs using registered handlers

=================================================
loading subtree to destination provided by the caller

  direct.length = 10071698309120
  direct.length_1 = 30340
  direct.length_2 = -3025

=================================================
Delete a key-value pair

delete <alpha/length>: fail (err -2)
  Can't to load the <alpha/length> value as expected

=================================================
Service a key-value pair without dedicated handlers

<gamma> = 0 (default)
save <gamma> key directly: fail (err -2)

##############
# iteration 3
##############

=================================================
basic load and save using registered handlers

load all key-value pairs using registered handlers
loading all settings under <beta> handler is done
loading all settings under <alpha> handler is done

save <alpha/beta/voltage> key directly: fail (err -2)
OK.

load <alpha/beta> key-value pairs using registered handlers
loading all settings under <beta> handler is done

save all key-value pairs using registered handlers

load all key-value pairs using registered handlers

=================================================
loading subtree to destination provided by the caller

  direct.length = 10071698309120
  direct.length_1 = 30340
  direct.length_2 = -3025

=================================================
Delete a key-value pair

delete <alpha/length>: fail (err -2)
  Can't to load the <alpha/length> value as expected

=================================================
Service a key-value pair without dedicated handlers

<gamma> = 0 (default)
save <gamma> key directly: fail (err -2)

##############
# iteration 4
##############

=================================================
basic load and save using registered handlers

load all key-value pairs using registered handlers
loading all settings under <beta> handler is done
loading all settings under <alpha> handler is done

save <alpha/beta/voltage> key directly: fail (err -2)
OK.

load <alpha/beta> key-value pairs using registered handlers
loading all settings under <beta> handler is done

save all key-value pairs using registered handlers

load all key-value pairs using registered handlers

=================================================
loading subtree to destination provided by the caller

  direct.length = 10071698309120
  direct.length_1 = 30340
  direct.length_2 = -3025

=================================================
Delete a key-value pair

delete <alpha/length>: fail (err -2)
  Can't to load the <alpha/length> value as expected

=================================================
Service a key-value pair without dedicated handlers

<gamma> = 0 (default)
save <gamma> key directly: fail (err -2)

##############
# iteration 5
##############

=================================================
basic load and save using registered handlers

load all key-value pairs using registered handlers
loading all settings under <beta> handler is done
loading all settings under <alpha> handler is done

save <alpha/beta/voltage> key directly: fail (err -2)
OK.

load <alpha/beta> key-value pairs using registered handlers
loading all settings under <beta> handler is done

save all key-value pairs using registered handlers

load all key-value pairs using registered handlers

=================================================
loading subtree to destination provided by the caller

  direct.length = 10071698309120
  direct.length_1 = 30340
  direct.length_2 = -3025

=================================================
Delete a key-value pair

delete <alpha/length>: fail (err -2)
  Can't to load the <alpha/length> value as expected

=================================================
Service a key-value pair without dedicated handlers

<gamma> = 0 (default)
save <gamma> key directly: fail (err -2)

=================================================
Inject the value to the setting destination in runtime

<alpha/beta/source> = RT
injected <alpha/beta/source>: OK.
  The settings destination off the key <alpha/beta/source> has got value: "RT"


=================================================
Read a value from the setting destination in runtime

fetched <alpha/beta/source>: OK.
  String value "rtos" was retrieved from the settings destination off the key <alpha/beta/source>

*** THE END  ***

I did not change any code yet.

using SDK 2.6.1

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