I use these tags exclusively for my custom coins (probably made like 60 of them) and never had the issue with FFFFFFFF files being created, so that is weird.
Just updated teddycloud and tried with a fresh tag and it is read correctly without the FF file.
Might be some weird configuration bug, maybe?
These are the patches that I activated on my boxes:
“patches”: [“altCa.305”, “altUrl.tc.fritz.box”, “blockCheck.310”, “uidCheck.307”, “noPass3.310”, “noPrivacy.310”]