Black square on top left corner

[thefiercerabbit]

I'm running KDE Plasma on arch, with i3 as window manager.

Besides the known limitations (including the buggy widget selector), a black square is visible on the top left of my screen. It disappears if I kill xembedsniproxy but then I don't see the icons in the system tray.
I am wondering if I am the only one this issue (which could be related to some other parameter), or if that's something other people observed too. I deleted all cache and config files related to KDE / Plasma, without success.

Packages versions:
plasma-desktop 5.23.3-1
plasma-framework 5.87.0-1
plasma-integration 5.23.3-1
plasma-workspace 5.23.3-1

[andrematias]

I have the same setup and same issue.
In my case, I have used redshift-qt to get an icon in system tray, that disappears when kill the xembededsniproxy. But just the black square and this icon disappear.