Please check this. My world is a wasteland.

I thought it was a kind of curious effect, it's like WW2, a giant crater outside my base. But then I started going down in the underworld and initially I thought it was some chunk error.

Truth is, while I was playing not only creepers detonated on the surface, but also all across the underground. It's all a giant hole now.

I chill in my base and keep hearing explosion sounds far away. This got to the point where it's unplayable. So I made a new world and went around in creative. I did spot some creeper with a glow effect that exploded soon after spawning, so I guess that's the problem.

Verified by spawning creepers with a command, they have a random chance to spawn charged due to the mod. As soon one gets spawned it immediately ignites and explodes. This is in creative, so the player is not causing the explosion.

Closing.

I think I figured out. It's an interaction with Fabrication mod: extra.creepers_explode_when_on_fire=false

If that option is set to true, then it will cause charged creepers to immediately explode.