Follow this thread for updates: PMS 1.32.6+ HW transcoding issues and corrections
TL;DR: For Gemini Lake (Celeron J4xxx), hardware accelerated transcoding working for SDR media in current beta, 1.32.6.7521. Tone mapping still not working.
EDIT: If you were referring to Apollo Lake (Celeron J3xxx), it was fixed in 1.32.5.7349. You can run current public, 1.32.5.7516, or beta releases.