Generator piston movement does not align with Tinkerer activation

Nos37

I was playing a female survivor on Xbox Series S on the Coal Tower map against a Hillbilly. I knew they had the perk Tinkerer and was watching the pistons of the generator I was repairing. When the 7th and 8th pistons begin moving I would know that the killer has no terror radius and would know my position.

However, the Hillbilly came zooming to my position with no terror radius BEFORE the 7th and 8th pistons began moving. There were no other survivors repairing generators at the time, so it's not like a different generator had activated Tinkerer. The Hillbilly did not have addons for a silent terror radius, and even if they did, they were not chainsaw sprinting long enough for it to trigger anyway.

Here's a video clip:

https://gameclips.io/Nos37/de29dca6-5f48-4032-9dbb-76631ed53943

sizzlingmario4

Tinkerer triggers at 70% progress, which is a little before the last set of pistons would start to move (which would be at 75%)

bjorksnas

https://forums.bhvr.com/dead-by-daylight/discussion/comment/3646373#Comment_3646373

Ditto, each set of pistons represent 25% progress, so tinkerer would proc 4.5s before the 4th set starts moving (not accounting faster speeds / skillchecks) giving billy plenty of time to rev and dash towards you before you can react to the fourth set moving to predict tinkerer