Black icon on system tray; icon shows instead into the top-left corner of the desktop

[town-crier]

Ubuntu 18.04.2 LTS with Gnome 3.28.2 I tried a couple of java applications, for example the one on StackOverflow

The icon shows up in the system tray as a black square, with the real icon showing up far away, in the top-left corner of the desktop, like shown in this image of a different application exhibiting the same behavior.

I have disabled Wayland, and I have also tried the original Topicons and the Topicons Redux fork. Same issue.

Any idea/pointer of something I can do to fix it in TopIcons? Looking Glass does not show any error.

[ghost]

I'm having the same issue in Solus GNOME

The wide empty space pictured below are my Slack/Quassel icons.. hidden because they are black against the plata-noir theme

[phocean]

So, if I understand well, is this a theme issue? Have you tried playing with brightness/saturation to check this?

[t-chab]

Same problem here, using Ubuntu LTS 20.04 and Gnome 3.36.8 with default java system tray tutorial and JDK v11