Apparently, if you modify the wrapper script at /opt/google/chrome/google-chrome to either comment out export LD_LIBRARY_PATH or prepend /usr/lib to it, this CLI flag starts working and it starts loading GTK4.
Apparently, if you modify the wrapper script at /opt/google/chrome/google-chrome to either comment out export LD_LIBRARY_PATH or prepend /usr/lib to it, this CLI flag starts working and it starts loading GTK4.