Missing Controller type - RPi PWM ws281x - Raspberry Pi OS 64bit

Hello,

I used to run hyperion on a RPi 3 but upgraded to a RPi 4 now, on this device I installed the 64 bit version of RaspberryOS because I need that for another application I'm running. However, now I'm not able to load my backed up configuration, the service will crash. After trying to reconfigure by hand I noticed that I cannot choose the ws281x Controller type and the whole RPi PWM is not present. Anyone had a similar problem or know if it might be caused by the 64 bit version of RaspberryOS?

Kind regards,

Sako

BTW I reflashed my RPi3 with the standard version of RaspberryOS and the ws281x Controller type reappeared so it does seem to be something in the 64 bit version of either Hyperion or RaspberryOS.