[1.12.2] Zombies aren't attacking villagers

[OakSamurai]

Hello! I know that 1.12 is outdated, but I have a heavily modded world that I can't export to the latest versions, and I was hoping that there might be an easy fix for this issue.

Anyway, I've noticed that zombies aren't attacking villagers (even in the hard difficulty, I also didn't perform any genetic modification). I tried with different mod versions and this happens from GR version 1.16 to 1.32. I've also tried with different forge versions (14.23.5.2860, 2859 and 2854), without success. Changing all the forge loader settings and messing with the GR config file settings didn't work either.
For these tests, I wasn't using any mods except GR.

Thanks in advance! As a researcher in the genetics field, I find this mod to be a masterpiece. Keep up the great work :D