"0300-0003-0006: Purged filaments piled up" NOT triggering

I’m having an issue where one of my X1Cs is not detecting waste build up to the point where It has completely engulfed the nozzle and hotend and carried on trying to print bending nozzles in the process

The way I understand it is that the camera is detecting it and I could clearly see it in the camera on the multiple occasions it has happened and not been detected

Are there any sensors or things I can clean OR have I accidently turned something off to make the triggering even more reliable? I don’t have this problem on other machines, it is detected reliably.