1.15 betas don't read blocks in /AddonFolder/blocks/....json unlike Minecraft Bedrock did in older versions
Comments 2
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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Do you have experimental gameplay on? Does the block have the
register_to_creative_menu
property set?