Screen blend mode is different or not properly working in 4k.
Example:
Create 3840x2160 (4k)
Place color matte (white)
Change its blend mode to screen
before you do this, please place colorful footage below the color matte (white) layer.
Compare the process above in 1080p 1920x1080, you will see the difference.
I reported this because I usually use flash effect (similar to trending capcut effects), it happens that my project is 4k.
My Adobe Premiere Pro version is up to date, July 23, 2024, paid license.