It’s a bit off-topic, but is there a bugtracker or anything related to collabora? There are a number of problems and on the forum it is difficult to keep track. We also don’t know if there is any collabora developer looking here.
If all works well but the document editing, then it has to be the latest modification of WOPI CheckFileInfo UserCanWrite property, which used to be a string value, but the WOPI standard mandated boolean value. The latest richdocuments a.k.a. Collabora Online connector app has the fix. Please update.