Still remains a concern to me in 1.4.5. Copious thanks for reminding me to update this - hopefully I'll learn to keep my issues up-to-date from now on. 🙂
But, yes. Please fix this. It's nasty because I like socializing with distant friends via the miracle of the microphone, and push-to-talk is a requirement to me.
I had this happen with quite specific circumstances:
1. Abandoned mineshaft had a tunnel full of spiderwebs, and I digged the side of the tunnel open (widened it by 1 block to skip all the spiderwebs).
2. Small spiders attacked me from the webbed part of the corridor.
3. I killed small spiders, they dropped XP orbs within the web blocks.
4. Standing outside the web block but next to it pulls the XP orb out of the web and awards me with a minor increase visible in my XP level bar, but without sound and the orb graphic gets stuck in the "magnetism towards player" behaviour, forever circling my head until I dis/reconnect (and the glitchy, floaty, magnety orbs are finally gone).
Seemed to me as if the orbs were getting picked up, but their visual representation and some collision trigger never happened after they were bugged from their time in the web.
Seems to be fixed in the latest development snapshot I just tried (snapshot 13w25a), played via the new launcher.
EDIT: Tried updating the issue after confirming this still affects the "old launcher" version 1.5.2, but couldn't add that to the affected versions list due to error claiming such a version tag doesn't exist.