no changes has been done to XMPP
Unfortunately I'm not able to help you to look more deep into this because I have no competence on that.
You may want resume a previous backup for resume the functionality until you maybe need to test the update in a separate instance until you are not able to figure out the issue you are facing.
I asked to the developer and no changes has been done to XMPP so please be sure the issue never start from something that changed in your server.
Be sure also to have followed correctly the update procedure by updating also the database.
Can you please check this?
This is very important for us - my operators are using XMPP as main notifications channel. Chats transfered from another departments with no operators online are not answered due to this.
Thank you
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