Whenever you get an impulse command block and change it to a chain (or vice versa) it stays as an impulse (or vice versa) physically but not visually and it ceases to work, only way around it is to manually give yourself a chain/impulse command block
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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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Per the Note in MCPE-71326, the information at the bottom right, including the command block type, is part of the Previous Output, so please do not consider that when determining the new command block type.
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