clipman plugin multiplying icon (XFCE panel rendering/painting issues)

I've just upgraded from Fedora 37 to 38 and now the clipman plugin icon is multiplying.

To the left of it I have the sensors plugin with two data sources.

Right mouse clicking these redundant icons does nothing, i.e. this is something which doesn't belong to either of these two plugins. I've no idea what's going on.

This is a little later:

So, something is rendering something where it shouldn't.

Here's a full list of enabled plugins: