Hi Mads, thank you for advice !
1. export clip to interlaced video looks good 🧐. Hmmm why? 😯
2. another file format instead of PNG, like Jpeg don’t help
3. timeline is 4K, and exporting to a final master in 1920×1080 HD and also in 4K is same problem
and all clips. if I make the source HD same problem
4. Deinterlace is set to none for the whole time timeline. Deinterlacing just that clip did not help. All my clips are Progressive.
I tried Gaussian Blur FX method and helped. So I applied it to all affected media, and the final render looks good.
But now the question is: why did this issue happen? The moiré patterns caused by scaling appear on almost all the media in my project.