Blank icon on taskbar

[w64bit]

I am using 921 on a 4k display laptop with 300% windows scaling.
If I pin the program to taskbar instead of the standard icon a blank icon is displayed.
How can I fix this?

[void]

I've added this to my Things to fix list.

For now, please see try changing your Taskbar Group Icon:
/support/everything/customizing/#taskbar_group_icon

Thanks for the bug report.