GTK2 Theme Error: Syntax error in Mint-L-Dark-Aqua causes Steam crash #542

Steam fails to launch when using the Mint-L-Dark-Aqua theme on Linux Mint 22.3. The crash is caused by a syntax error in the GTK2 resource file.

Error Log:
/usr/share/themes/Mint-L-Dark-Aqua/gtk-2.0/main.rc:1085: error: unexpected identifier 'direction', expected character '}'

Steps to Reproduce:
1)Set system theme to Mint-L-Dark-Aqua.
2)Attempt to launch Steam from terminal or menu.
3)Steam process terminates immediately after initializing logging.

Environment:
OS: Linux Mint 22.3
Desktop Environment: Cinnamon
Theme: Mint-L-Dark-Aqua

Current Workaround:
Launching Steam with a different GTK2 theme bypasses the crash:
GTK2_RC_FILES=/usr/share/themes/Adwaita/gtk-2.0/gtkrc steam

Debug session and context can be found here: https://gemini.google.com/share/92b08a6f9d8d