Works on 1.21. Materials tested: stone, tuff, andesite, granite, stone brick, terracotta.
Tail, I have recreated it in normal vanilla (1.18.1) and note that the previous one was OptiFine (pre_release 1.18.1 H5)
yes, except that normal leads to needing a command to kill them (at least for armor stands).
Works on 1.21. Materials tested: stone, tuff, andesite, granite, stone brick, terracotta.