from rain to dry track instantly

Just doing a race in japan its been raining for hours, top 6 on grid were on wets other 6 on drys, wet guys 6- 10 secs faster in quali, sitting on the grid the rain stopped 5 mins b4 race start yet there was no standing water, there appeared to be virtually no wetness at all and the hards were quicker on lap 2 or 3 once up to temp. dont know if a bug or just the way it is but seems a bit wrong to go dry almost instantly. It wasn't light rain.

https://igpmanager.com/play/?url=race-live/78585/2d

Only thing I can think of is if it dried up right after Qualifying and before the race, during the 20 minute gap

its was still raining on the live weather facility etc and it said it was gonna clear up in a few mins &  5 mins b4 the start it stopped raining, i had the page open for 7-8 mins b4 start and it had been raining continually for the previous 2 hours.