tyPreview appearance_lights error

[NiK684]

And another bug in the tyPreview. Not sure if it needs a different post.

I'm replacing default max grabber with tyPreview and there is a for loop in my script where I run preview with different settings.
I noticed that some previews have strange pixels offset. After some research I've found that tyPreview creates good preview only in first iteration in a loop, but then it creates those previews with offset. Presumably because for loop doesn't wait for some tyPreview ending procedure and next tyPreview grab starting in some wrong state.

I've found a dirty fix on maxscript side:

Code:

(
    clearlistener()
    fn Grab i =
    (        
        f = @"D:\Downloads\tygrab\" + i as string
        tyPreview output_filename:f appearance_safeFrames:off
        
        colorman.repaintUI #repaintAll
        windows.processpostedmessages()
    )
    
    for i=1 to 2 do
    (
        Grab i
    )
)

These two strings together are fixing the issue:
colorman.repaintUI #repaintAll
windows.processpostedmessages()

3ds Max 2020.3
To reproduce this bug you can comment those 2 lines and grab some camera animation around a Teapot.
____
Of course I've already fixed it for myself, but tyPreview would be even better without this bug