When a player walks into a blackstone block, (I did it while standing on netherack in a basalt delta), they go through the block and end up inside of it. It acts like a normal suffocation.
Comments 2
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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Does MCPE-109925 describe your issue?