Hi @angus - thanks for your response. Sadly I’m not willing to upgrade our production installation to a beta version or the current git master. I guess I’ll be waiting until a new stable version of discourse has been tagged/released.
By the way: Is there some structured information available that would indicate the minimum version requirement of a plugin? I didn’t see it here in the initial post of the thread, and also not on GitHub - discourse/discourse-activity-pub: Adds ActivityPub support to Discourse. · GitHub
In other software projects/products, plugins usually indicate version compatibility.
Given that the plugin has been around for more than a year, I guess another option would be to downgrade to an earlier version of the plugin, from around the time where 3.3.2 was current? However, in the commit log I couldn’t immediately see any references to discourse versions.