Small Humanoids (BodyScale 0.5 and lower) have an “ice skating” effect when moving around. It takes a long time for them to accelerate / decelerate. This issue may have regressed if it was previously fixed.
I have created a simple open source repro place here to see the issue clearly. Default humanoid size is set to 0.2.
Btw please don’t post new bug reports if you know there are others. It clutters up the posts page.
To answer your question, refer to this post.
TLDR: A while back a flag was changed so that the force being applied on a humanoid now messes up small bois. You can fix this problem by changing some physics properties (detailed in the post).
I also think there was a mod post about this but I can’t find it…
I’ve seen that post, it is not a solution or even an acceptable workaround.
Also, I consider it grounds for a new bug report if the previous bug reports were over a year ago, as it’s possible this was addressed at some point and this issue is a recent regression.
Moved to the existing bug report