When using the Structurize mod, grass changes colour and overlays may z-fight with existing buildings.

Structurize is a dependency of Minecolonies. So for testing I would suggest installing Minecolonies and cheating in a Build Tool.

This is on Minecraft version 1.92.1 with Rubidium 0.6.2 and Structurize 1.0.460, with Nvidia proprietary driver version 510.85.02.