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UART example in SDK 13.0.0 will not connect

The UART example in examples\ble_peripheral\ble_app_uart will not connect with SDK 13.0.0. This example was running just fine with v11.0.0 (Softdevice S132 v2.0.0) and v12.2.0 (Softdevice S132 v3.0.0) but now when I am trying to upgrade to SDK 13.0.0 (Softdevice S132 v4.0.2) I can not get a connection.

I have been trying the apps "nRF Connect" and "nRF UART v2.0" without success. This was no problem with v11 and v12.

I downloaded the SDK v13.0.0_04a0bfd from here: developer.nordicsemi.com/.../

The evaluation board I'm using is a PCA10040 V1.1.0

Where should I start looking?

Edit: The debug log looks like this (with settings #define NRF_LOG_DEFAULT_LEVEL 4 and #define NRF_LOG_BACKEND_SERIAL_USES_UART 1):

UART Start!
                                                               
SDH:DEBUG:RAM start at 0x200025f8.

                                      
                                                                            
UART Start!
                                                               
APP:INFO:UART Start!
                                                      
nrf_ble_gatt:DEBUG:Requesting to update ATT MTU to 64 bytes on connection 0x0.

nrf_ble_gatt:DEBUG:Requesting to update data length to 162 on connection 0x0.

APP:INFO:Connected
                                                        
APP:INFO:Disconnected
                                                     
nrf_ble_gatt:DEBUG:Requesting to update ATT MTU to 64 bytes on connection 0x0.

nrf_ble_gatt:DEBUG:Requesting to update data length to 162 on connection 0x0.

APP:INFO:Connected
                                                        
nrf_ble_gatt:DEBUG:ATT MTU updated to 64 bytes on connection 0x0 (response).

APP:INFO:Data len is set to 0x3D(61)
                                      
APP:DEBUG:ATT MTU exchange completed. central 0x9e peripheral 0x40
        
APP:INFO:Disconnected
                                                     
nrf_ble_gatt:DEBUG:Requesting to update ATT MTU to 64 bytes on connection 0x0.

nrf_ble_gatt:DEBUG:Requesting to update data length to 162 on connection 0x0.

APP:INFO:Connected
                                                        
APP:INFO:Disconnected
                                                     
nrf_ble_gatt:DEBUG:Requesting to update ATT MTU to 64 bytes on connection 0x0.

nrf_ble_gatt:DEBUG:Requesting to update data length to 162 on connection 0x0.

APP:INFO:Connected
                                                        
APP:INFO:Disconnected
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