Weird white line under bookmarks bar when using a theme

Issue
When using a theme (one of those created by the Chrome team, available on the Web Store), a disturbing white bar appears between the bottom of the bookmarks bar and the top of the website displayed. It is particularly apparent when using a dark mode extension.
This white bar isn’t present in Chrome.

Steps to Reproduce (add as many as necessary):

  1. Install a theme, dark (black, dark blue, brown…) if possible.
  2. Look at the white bar, obviously

Expected result:
Well, no white bar

Reproduces how often:
Permanent.

Brave Version(about:brave):
The most recent, I downloaded Brave today (yay!)

Reproducible on current live release (yes/no):
Yes

Additional Information:

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