Since the Notebook is like 3 days old, there never was an old kernel to begin with 
As far as I can establish, it might go into the direction of the ACPI thermal zone bug, that should have been fixed somewhere around BIOS / Firmware 3.03 (see: this post and/or around Kernel 6.9), which makes me wonder:
If I have the Expansion Bay Shell in, I’ve got 4 ACPI thermal zones (0-4), all of them showing proper temperatures (sensors). Suspend and Hibernate both work fine.
If I add the AMD Radeon™ RX 7700S expansion board, there are 4 zones added (4-7) for a total of 8. But: I get the error
ACPI: thermal: [Firmware Bug]: Invalid critical threshold (-274000) ACPI: thermal: [Firmware Bug]: No valid trip points!
for each of them (journalctl -b | grep thermal). And the four additional sensors do not show any values (sensors).