Hi, apologies by the delay in replying, we needed some time to found the problem: it seems a bug checking the animation intervals of the custom object.
As workaraund, please try adding extra keyframes in the Track view for the Scale gizmo, as shown in the screenshot. The value for the keyframe may be the same of frame 100.
In this case, i added a keyframe at frame 0. Just to be sure, i suggest to add other at end, for example in frame 0 (in this case with value 100). That should solve the problem.
We'll fix the bug in next updates.