Transparency breaks separators

[tinmarr]

I have transparency enabled with the new Emacs 29 feature:

(set-frame-parameter nil 'alpha-background 90)

(add-to-list 'default-frame-alist '(alpha-background . 90))

This causes the modeline to look like this:

Disabling transparency fixes the issue, and increasing it makes it worse

^alpha of 70

Tried setting powerline-image-apple-rgb but just seems to make the problem worse.

Emacs Version:
GNU Emacs 29.3 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.41, cairo version 1.18.0)