One of the paths where the message channel was owned by someone else did not check for internal requests and divert them to the internal handler.
Looks reasonable, please apply to t-m-c-5.8 and merge into master.
Merged. Shuld go out in the next release.
2373 % git tag --contains=232cc604d7827c51456534976cf8c69446b3418b telepathy-mission-control-5.8.0 telepathy-mission-control-5.9.1
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