When using a structure block to move duplicate End Gateway blocks as decoration, some behind glass began flickering. While putting more near each other in a completely new word after copying one from the End, the same result occurred. It also does this with command placed Nether Portal blocks and also somewhat with other End Gateways when they are right next to each other.
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We're tracking this issue in MCPE-55778, so this ticket is being resolved and linked as a duplicate.
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