Bug reports with reproduction steps sent to Unity.
Animation Clips get prematurely abandoned by the Animator Controller and don't play to the end, leaving animated properties in an intermediate state.
Animation Clips assume control over the properties they animate and don't let scripts change the value of said properties, even if the animation clip never plays.
I've decided to make my bug reports public, especially those deemed "By Design" or "Won't Fix" so that there is a public record of pitfalls I encountered. May it help you avoid the same pitfalls.
If you would like to contribute, upload your reproduction case to a public repository and send me the address. I will link to it here.