Repro:

- create an animation and convert it to clips
- duplicate that clip and match offset
- add an activation track (no binding)
- deactivate preview, move the playhead after the animations
- move the activation track outside of his track and around

eventually when the activation track hit the playhead it does move the object even if there isn't any animation playing, if you try to play the sequence, only first clip will play.

workaround: disable and re-enable preview

attached a video showing the issue along with my project