As I understand it, the data in the command block is written incorrectly. In the screenshots, you can see how this error is displayed in minecraft and in the NBT editor.
Installing a new block, changing its parameters does not change anything.
Also, this error happens only in certain places of my world, I think it is somehow connected with chunks.
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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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Thank you for your report!
However, this issue has been temporarily resolved as Awaiting Response
Is this still an issue in the latest version?
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