I can’t find anything related to this bug with search keywords such as ‘channel’ or ‘animation’, so I will post this here.
Channeling animations can be canceled via switching your weapon to the next set (`). This is problematic, because many Heart quest completion methods that require you to channel on an object (ie. ‘repair the flag’) have the completion bar raised at the START of the animation; the added channeling becomes meaningless entirely.
Rarely, you can get stuck in the channeling animation if you attempt the above; the channel bar doesn’t go away, and you cannot perform any actions. The best way to break out of this is to force a different animation loop, i.e. by dancing out of it.
It’s a fairly minor bug, I’m sure, but it might be noteworthy for future additions that require channeling.