No UI issues, properly displayed "New Tab" button
A spot get's displayed on "New Tab" button
► Screenshots
UNITO-UNDERSCORE!screenshot!UNITO-UNDERSCORE!20200603-140821!
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I can reproduce this, though the "spot" doesn't stay there, it disappears after about 1 second.
@darkwing can you still repro?
@ekager I'm still able to reproduce this issue on the latest Nightly 7/13 with Google Pixel 4 XL (11).

Hi, verified as fixed on the latest Nightly Build 200826 using the following devices:
• Google Pixel 3a (Android 10)
• Huawei Mate 20 Lite (Android 10)
• OnePlus A3 (Android 6.0.1)
► Video
