Conversations got support for MAM:1. Compatibility with MAM_MUC should be restored in the next version :)
https://github.com/siacs/Conversations/commit/48e366e4108cf509631f753dc3d16ab0ab483276
@trashserver what is mam:1 ?
@Muto it is a version of MAM (Message Archive Management)... which helps synchronize messages between clients.
One of the first Mastodon instances, there is no specific topic we're into, just enjoy your time!