Media icons are backwards in RTL environments.
Steps to reproduce
media-playback-start-symbolicor another directional media icon in an RTL environment.
The icon points in the opposite direction as in an LTR environment.
The icon should point in the same direction in both environments. From https://material.io/design/usability/bidirectionality.html#mirroring-elements:
Do not mirror media playback or progress bars. The direction of these elements represents the direction of the tape, not the direction of time.
GTK 3.24.13, Debian testing