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Description
#15965 introduced a regression in leaving MLS conversations. Leaving a MLS conversation is different than removing other users (we cannot send remove proposal for the self client, remove proposal has to be created by backend). When leaving MLS conversation we should remove self user "the proteus way", so just send a request to backend. For more details see https://wearezeta.atlassian.net/wiki/spaces/ENGINEERIN/pages/157287189/Use+case+leaving+a+conversation.
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