I guess GenP needs to be updated, i believe v4.0.1 was coming? i had the same issue but the Repack by m0nkrus release seemed to work fine with latest version of Media Encoder.

Ahh no, i deleted it myself because your post basically answered my question.

https://lemmy.dbzer0.com/post/65269616

I asked a similar question few days ago here, but this explains it then thx