Graf Zahl, one of the authors of GZDoom, has been introducing AI code to the base without communicating with other developers on the project. As a result, the project has forked with seemingly everyone who was keeping GZDoom alive moving over to the new base called UZDoom.

More information below:

https://github.com/ZDoom/gzdoom/commit/584af500736b0317e42824f39285ed3d954fc4e2#r167896561

https://github.com/ZDoom/gzdoom/issues/3395

https://github.com/UZDoom/UZDoom

https://www.gamingonlinux.com/2025/10/many-developers-leave-gzdoom-due-to-leader-conflicts-and-fork-it-into-uzdoom/