When a user leaves the room, we show mxid rather than displayname

[ara4n]

At least for freenode users. This shows the confusion:

i assume this is a sentinel-style bug (on RIot 0.13.5)

[ara4n]

also present on 0.14.

[lampholder]

p1 major 'cause we shouldn't display mxids unnecessarily.

[t3chguy]

@lampholder seems fine to me

likely just missing state on the client for one reason or another (/me looks at Synapse menacingly)

[t3chguy]

for Freenode users too:

[t3chguy]

Have not seen this in a very long time, has anyone else?

[turt2live]

I've seen it somewhat recently (last few months). It's likely a case of #7843