Falling block entities such as Falling sand gravel concrete powder go through portals they become solid again then a falling block again unlike in the Java edition
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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Please clarify your observed and expected results from pushing a falling block into a portal. I am not sure how you are arriving at the conclusion that "they become solid again then a falling block again". A video of the issue would help.