dect shell example always calls nrf_modem_fault_handler at init

Im using two Thingy:91 X, Toolchain is v2.9.0. I build and flash the dect shell example. I select build configuration thingy91x/nrf9151/ns. No other changes.

Both devices report modem crashes on the terminal and stop further execution:

If i use button 2 for reset, the output is a little longer, but essentially the same:

If i remove the assert in the nrf_modem_fault_handler, it crashes on some other dect phy command.

Is there a fundamental step im missing for using DECT NR+ with the Thingy:91 X?

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