Affects 21w13a. They still stop at y=0. The ice is sometimes replaced by stone in the cave ceilings (but have ice below and above).
Can confirm in 21w11a.
(seed: 6925904453966683040, x: -91, y: -10, z:1656)
Got fixed in 18w43c
If you just place a gloem and a pillager they are fighting but if you cower the pillagers as in the picture the golem can't find them. I tested it again right now.
Can confirm in 21w13a