Slimes can damage the player without actually hitting them

I cannot reproduce this. See

In your video it is not clear that the slime is not touching you. Are you using a non-default field-of-view setting? Have you looked at the behavior in third person view?

Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.

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