Connection problem with SKR 1.3 MCU after every "Firmware Restart"

Basic Information:

Printer Model: Selfmade bedslinger
MCU / Printerboard: BTT SKR 1.3
klippy.log
klippy.log (643.8 KB)

Describe your issue:

I have an old bed slinger that used an MKS GenL card for a long time. I have now got my hands on a BTT SKR 1.3 and installed it on my printer. If I start up my printer it all works well, but if I do a firmware restart manually or due to a save_config I lose contact with the MCU. Then I will have to do a complete restart to get it up and running again.

Runnning Klipper v0.11.0-41-g9b60daf6, Moonraker v0.7.1-790-g358aee9 and Mainsail v2.4.1

Do anyone have some ideas on where to start troubleshooting?