When getting anywhere near to glass or glass pains they get super glitchy and start going crazy.
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Thank you for your report!
We're forward-resolving and linking this ticket as a duplicate of MCPE-231582, as that ticket contains more detailed information and/or has already been triaged by Mojang.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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As a workaround, disabling the “Enable Dithering for Blocks” option in Settings > Accessibility should prevent the issue from occurring.