I can fully aggree with the problem and with a tool like SimHub you can see it.
After pressing "drive" I am standing only in the box and the pressure in the front tyres start to increase.
Something happen, because some weeks ago it was more worst.
Oh, the temperature of the front tyres increase also.
Since the last BOP and the new tyres something is wrong.
The failure happens not onyl on Multiplayer it happens also as Single Player.
I have never been able to verify this either, but that is only using the ingame onscreen tire pressures/temperature colors.I have tried it and the first time I got 143/141 but the presures weren't rising. Returning to the monitor and to the car again they were 141/141 decreasing to 140/140. I've waited a couple of minutes. I didn't got a difference so high as yours and they never raised while standing. No increase in temperature either.
I have never been able to verify this either, but that is only using the ingame onscreen tire pressures/temperature colors.