New tab button barely visible on non-opaque backgrounds on macOS

[Aaron-212]

Set background-opacity = 0.85 and launch a new Ghostty window:

However, there's weird "workaround", launch a new Ghostty window with background-opacity = 1:

Then set background-opacity = 0.85 and refresh config:

Issue only appears on dark themes, new tab button looks good with light themes.

[00-kat]

Duplicate of #4288.