Hi All
I know this topic is old, but I came across this issue last week and none of the comments here helped in my case.
The solution that worked for me was checking the "prevent users from clicking on the base layer", then all animations worked correctly. If your trouble is on the base layer, duplicate it to a new layer and set a "show layer" trigger on the base layer to start when the timeline starts. The user will not see or notice the difference.
It's not a pretty workaround, but an effective one in a pinch - I hope this helps someone in the community :)