Icons missing in Dock

[hamburgerjungejr]

Hi,

from time to time I'm missing icons in the Dock (The bar, in my case at the bottom of the screen, where all open programs are shown)
Only a red rectangle is shown.

After restarting the gnome desktop (Alt+F2, r) the icon is shown.

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How can I fix this. It is a bit difficult to switch between multiple VMs if the OS is not shown in the Dock.

Greetings
HamburgerJungeJr

[hamburgerjungejr]

Nobody got any idea?

The 19.10 update changed nothing

[deadflowr]

Do you know what icon theme pack it is?
Does it happen across an array of different icon themes?

[hamburgerjungejr]

I'm using the standard Yaru Theme with the Flat-Remix Theme for the Applications as well as Dash-To-Dock.

The Appearance-Settings
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My Dash-To-Dock Settings:
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