Android app lost shared password setting

After initial setup and sync I notices that the remote (untrusted) server showed a notice “Failure checking encryption consistency with device DDDDD for folder “FFFFFFF” (ffffffff): remote expects to exchange plain data, but is configured to be encrypted”

This happened for more than one folder. The remote device wasn’t marked as “Untrusted” under device → advanced settings but all the folders had password set.

This feels pretty dangerous.