What causes the stupid stuck while grabbing a survivor mid vaulting but they're still running away?

You know the one where you'd grab a survivor while they're mid vaulting, the killer begins to play the the start of the grab animation. But the killer can't move or do anything for anywhere between 5 seconds to the entirety of the match.

The survivor wasn't grabbed and they're able to freely run away while the killer stands there like an idiot.

This is a regular occurrence and its lost me dozens of matches.

I'm not sure if its killer specific but it occurs the most in my Pig and Spirit matches.

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