i was unable to reproduce this. i think this happens when the the chat is cleared then the stream instantly ends? or it could be something entirely different.
#chat collapses after chat being cleared(?)
strange fossil
for context:
user being weird>was perm banned(still saw messages)>chat was cleared and stream ended instantly and restarted
or this could be me being stupid 🙃
rugged trellis
I've personally experienced this issue in my own time, it seems related to chat clear; if anyone finds a way to replicate somewhat consistently let me know
limpid stag
I've personally experienced this issue in my own time, it seems related to chat ...
i used to be able to reproduce this on the old versions but it seems to be fixed now... similarly if you have the emote menu opened and you get timed out or banned, the emote menu is broken and cannot be reopened when the punishment ends and requires an F5
probably should have been it's own issue post but it's related so 
strange fossil
happened again, i think it happens when chat has been talked in for a while
but i dunno
thick parcel
Might be caused by the "shield mode". Just happened to me and after refresh it showed chat clear, emote mode and sub mode being toggled.
thick parcel
Tested it. Chat is in Firefox window with only 7TV Beta extension and not logged in. Bug does not appear if you are a moderator. Bug also happens on chrome based browsers like Brave.