Not sure what your specific issue is, but for me, I had to fix some problems on my existing server save in singleplayer. When I went to reupload it, it would only work if I renamed the .db and .fwl files to something new before zipping uploading.
As the title says. Any time the form is used to edit valheim_plus.cfg, Disable Food Degradation boolean is always written to false, regardless of the selected form value, and regardless of previous setting in valheim_plus.cfg. This means manual edits via FTP will be overwritten on form use. Judging from a couple of other posts, this might not be the only setting that this happens with.