Mixer Brush start white or black, not clean.
I usually use a mixer brush to remove wrinkles from clothes.

Then set the mixer brush to a clean brush. Reset every stroke
like this.
But, when after update
Each stroke starts in black or white.
And when you start painting the brush, it changes back to "empty" like the picture above, and when you finish painting the brush, solid color (black or white) is designated again.

And not every time, but sometimes the clean brush is maintained. However, if you change the brush size there, it changes to black or white again.
It's a very strange bug. Please correct it.
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I've been posting a few times on the Adobe Forum, and I've done things that I can check and try when there's a bug.
1. reset pref.
2. maually reset pref folder
3. check GPU driver for Latest current.
4. Turn on/off Multi thread
5. Deactive native canvas.
6. Reinstall Photoshop.
My pc is window10.
