When you go up to 69-70 blocks
Beam of a beacon disappears
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Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-25228 in favour of the more general or better information provided.
It has been linked to this report. If you have additional information, please add it to that report.
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Duplicate of https://bugs.mojang.com/browse/MCPE-17595 and many other duplicates.