Strange behavior after upgrading to 5.05

Good Evening
Something strange happens after upgrading to 5.05.
I choose the white color as a shadow on a word, but when I turn the page and repeat the same process on another word and return to the previous page, the shadow changes to gray by itself.
The white shadows existed from version 4 and everything was fine. Is there a cure for this phenomenon?

I’ve ran into this issue as well and shared my Sparkle project with @duncan. I would expect a fix soon.

The same happens here