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As per the spec: https://spec.matrix.org/v1.7/rooms/v10/#authorization-rules
"If membership is leave"
->
"If the sender matches state_key, allow if and only if that user’s current membership state is invite, join, or knock."
I.e. a user can kick themselves. Bridges use this to make a user leave while giving a reason.
Some recent change (likely 8ea1a11 but I'm not 100% sure) changed that behaviour, resulting in heisenbridge being unable to make users leave while giving a reason.
This works fine on Synapse.