User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:73.0) Gecko/20100101 Firefox/73.0

Steps to reproduce:

I logged in onto my XMPP account using other XMPP clients (Conversations and Dino) joining group chats and adding bookmarks. Then I added my account in Thunderbird and logged in.

Actual results:

When I logged into my XMPP account on Thunderbird, I only saw list of my contacts on the left and not any of the group chats that I have as bookmarks.

Expected results:

Thunderbird should have used checked my bookmarks from the server (XEP 0048 https://xmpp.org/extensions/xep-0048.html) and automatically joined me to the group chats that I have bookmarked being a member of them on my other clients.