SU6: WindShield material for scenery objects causes shimmering

Hi. We have been using WindShield material for tower windows to simulate
raindrops during rain and it worked great. From SU6 this does not seem to be
working correctly as it causes shimmering when WindShield material is used on
both sides of the glass. If it is used on Exterior or Interior only then it is
fine. I believe it should work on both sides without any shimmering or perhaps
we are doing something wrong. We would appreciate any suggestions. Here are
our material settings:

regards Stanislaw

Try alpha mode mask or blend instead of opaque, also roughness zero instead
0.1 S.