So, it seems iron golems blood if you damage them and then they bleed, if you leave the area primarily get out of its render distance and then return the iron golem blood will seemingly return to regular blood and not have its lil blocky blood type, seems like a small scale bug i thought worth letting the mod creator know about. Awesome mod btw, anyways have a good day.

okay to further note, seems the same applies for colored blood if you attack a spider and it bleeds if you leave the area of the crime and again get out of the render distance of where u assumingly killed the spider and where-ever the area of sprayed green blood is, when you return the bloods color will have changed back to red.

Oh, this is a good find, and something I haven't accounted for. Will be looking into this for the next update!