Thanks for bringing this to our attention, we are aware of the issue. It is due to the animation editor clearing the clipboard upon opening. Unfortunately, this is the result of rather limited access to the application clipboard that plugins have in studio, as well as not having an official way to hook into paste events. This seems to be a growing problem for our users though, as this is not the first report. I’ll work on seeing if we can improve plugin capabilities for this in the future, in the meantime I am considering changing the key binding if this becomes too large of a problem.
Recommended workaround for now is to copy the animation id from an external source/text editor after the animation editor has opened.