As of plasma 5.23.3, /usr/share/icons/breeze and /usr/share/icons/breeze-dark are identical. All the icons in breeze-dark have a fill of "#232629", instead of "#eff0f1" as it should have.
STEPS TO REPRODUCE
1. go to /usr/share/icons/breeze-dark and notice the issue
breeze-dark theme was overwritten with breeze by accident I assume, causing many visual bugs in unrelated applications.
breeze-dark icons should be white.
Any plasma 5.23.3 is affected, Manjaro and Kde Neon alike.
Same bug mentioned here, but under the wrong component:
Either if this is marked as duplicate or that one, please fix the bug.
*** This bug has been marked as a duplicate of bug 445489 ***