Thinking about it, that definitely seems to be the case, as it fixes itself when I recast the spell. Will try and re-equip it each time I leave wildshape (if possible, sometimes it's in combat) to see if that works.

Maybe it's because of bugs or issues where allowing those spell interactions while in wild shape, but I completely agree (and think that's a huge part of the point of wild shape) that you should be able to interact with them. I'll try to raise it up with them.