Starting from version 1.20.60, custom blocks become invisible if there are too many of them in the chunk.
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If you remove some of them, then the problem disappears. Also this problem does not exist on older versions such as 1.20.50
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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Resolving temporarily as Awaiting Response. Could you add an example add-on to your report?
This ticket will reopen automatically when you reply.