I've found 2 gravitational anomalies so far, one while exploring in the nether and one near my home. I've tried to grow both so they would actually be a viable power source however they won't suck up items. It does grab torches if I place them right by it. I've tested this in a single player and the smallest size of anomaly should be able to suck up any item. Any solutions? Screenshots:
We've patched the anomalies to fix an issue with them spraying oil everywhere and demolishing server performance. I'm pretty sure this patch is applied on horizons, and this sounds exactly like the behaviour that we patched out. Unforunately, if this is in fact the case, you'll have to wait until the mod developer fixes the oil-spray issue, and we can disable the patch.