You can close this bug report as I can reproduce when I installed stretch handbrake_1.2.2+ds1-1_amd64.deb with its required dependencies from strech (libdvdread4_6.0.1-1, libx265-165_2.9-4, libx264- 155_0.155.2917+git0a84d98-2). This even with bookworm libgtk-3-0 3.24.35-2 and all other dependencies untouched.
And with only change being upgrading handbrake 1.5.1+ds1-3 (bookworm and sid) and handbrake 1.3.1+ds1-2+b3 (bullseye stable) the issue is fixed. Best Regards, Alban