Weird bug? Animated constraint influence in properties panel does not update

I have a strange issue where the 'influence ’ amount in the properties panel of a an animated bone constraint isn’t updating, even thought the influence amount in the graph editor is working as expected (making the head look down at an empty)

Furthermore, if I use the eye icon to mute the constraint, the animation of the rest of the rig pops to a different pose. I had a similar issue before in a different project (Items would just to different positions when trying to animate other things) but never managed to reduce the blendfile enough to attach it here for troubleshooting.

Whilst doing it for this project, however, I found that deleting the 2nd scene, which just contains an empty and a point light, will make things work as expected.

And, just now, I deleted the point light and that by itself fixed everything, but if I delete just the empty from scene 2, the problem persists. Quite puzzling!

Here’s the .blend if any of you kind souls fancy taking a look:
Rig_Snapping_Issue.blend (1.2 MB)

Hi, i am on 4.1 and all is fine my end.



Yeah, I opened up the file to show a colleague and everything was working as expected.

Weirdly, the original file that I was working on was also still doing the same thing (If I selected an IK control the rig would just to a pose from further on in the timeline, etc) but now, again, that’s working fine too… Mystery!

Got a similar issue that I (Hopefully) managed to capture here: