For one particular game, the next user name is blank. Now I know, it is not a problem, just a display bug.
It is because of the curly bracket in their username.
[EC] Mesias-G {TteGen}
Game:
https://www.playyourdamnturn.com/game/a8617146-64e2-4f50-a16c-3d6573f26bea
I tried manually entering the name in a mock hotseat game.
Entered: [EC] Mesias-G {TteGen}
Civ auto changed it to [EC] Mesias-G \{TteGen}
Note the escape before the curly bracket.
Since I was at it I typed every non-alpha character in to the name and found many were ignored and only one escaped.
Ignored on display, however present when editing.
` (backwards comma under the tilde key)
|
\
:
;
"
'
<
>
,
.
?
/
Escaped:
{ (only this one)