When you break the End portal frame, the particles remain. The particles should deactivate when the portal frame is broken.
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is duplicated by 1
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Thank you for your report!
However, this issue has been closed as Working as Intended.
This behaviour is the same as the PC version, and it's been suggested that because end portals cannot be broken in survival, it's a non-issue.
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I can confirm it as I'm having the same issue.