ran into a problem. If you move away from the farm, the experience stops accumulating in the tank. I'm using ftbchanks and item transfer works as it should. However, experience is a problem. help
i play on ATM8 modpack

Running into the same thing, except I have no mobs spawning at all (using the Dreaded Earth) once I get approx > 8 chunks away from the farm. Farm is chunkloaded but I'm within the render/simulation distance anyway.

Edit: A little more testing and it's outside of the 128 block radius so I think what's happening is that the mobs immediately despawning (per vanilla rules). I was under the impression that in older versions (of this mod) that the despawn was bypassed, but maybe I always was just lucky enough to build my farm within 128 blocks of my base.

Edit 2: Adding this mod resolves the issue: https://www.curseforge.com/minecraft/mc-mods/mob-despawn-timers