Squeaking noise from engine on stage 1a

I've recently noticed a squeaking noise coming from the driver / transmission side of the engine bay on stage 1a, after transitioning to 1b I can't hear it anymore.

I can't reproduce the sound in inspection mode.

I thought it could be the engine coolant pump, but I turned it on with engine off with techstream, and there is no squeaking, so I would rule it out.

The car has 310k KM.
Transmission oil changed every 90k Km
Virtually no engine oil consumption.
No DTC codes.

What could it be?

 

it occurs when the car is stationary

 

edited original post and added recording
https://photos.app.goo.gl/89QQQJvgXrzjg2ER6

 

If I understand well in S1a MG1 and MG2 are not turning, the only thing spinning is the ice and torque limiter ( the clutch on the flywheel ).
My theory is that the coil springs on the clutch developed some play and squeak, since they have no lubrication and they absorb the infamous startup shudders caused by shut off while the ice is still charging the hv battery.

I can confirm the squeaking stops as soon as the ice is under load i.e. charging the hv battery