Describe the bug
Converse.js is currently using the pre-XEP namespace for MUC hats, xmpp:prosody.im/protocol/hats:1.

The XEP was updated and now uses the namespace urn:xmpp:hats:0.

The syntax is identical between these namespaces.

From the next release, Prosody will only convey hats using the XEP namespace by default.

For Prosody admins reading this issue, the old namespace can be re-enabled with the following Prosody config:

muc_hats_compat = true