Wrt32x / snapshot sysupgrade - config not saved

That is normal.
It came with kernel 5.15, if I remember right.
Upstream Linux started to "helpfully" warn about non-UBI FS on NAND flash (also for wifi calibration etc. read-only partitions)

But you might be interested in

EDIT:
Regarding (the non-related) UBI NAND messages, I found the old message from bmork that he sent to kernel.org mailing list about those NAND warnings after the issue had risen here in the OpenWrt, but I can't find the original old local discussion.

EDIT2:
Surprisingly, the discussion was newer, and in the LuCI repo...

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