Taking off an armor item added by a behavior pack causes your status effects (whether obtained normally or by commands) to be cleared, and you can't get them again until you put them back on.
On the world shown in the attached clip, the holiday creator features and additional modding capabilities settings are on.
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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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Is this still an issue in the latest version (1.17.2)? If so, can you please add it to the affected versions (or mention it if you are not the reporter).
This ticket will automatically reopen when you reply.