This glitch basically makes it so you can destroy the end portal by placing sticky pistons in it that are powered and then so the piston head is in the portal, then activate the portal. The piston heads and the end portal will combine or something. But if you place blocks on top of the pistons then retract them it deletes the end portal.
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We're tracking this issue in MCPE-129526, so this ticket is being resolved and linked as a duplicate.
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