This comment (last parts) seems to be explaining everything:
(...) it seems, that anti-spoiler can hide only one-line sentence. Breaking sentences into more than one line or trying to hide lists produces a very strange and not looking good effect.
Is it possible to use anti-spoiler tag (
>!) to hide a list or block of text? Or what am I doing wrong?
I tried both with unordered list and with "converting" it into multi-line block of text, replacing "dots" with "a)", "b)", "c)" etc. All for nothing -- any attempt, that I undertook ended in converting multi-line block of text or list into single line (hidden behind anti-spoiler).
What am I missing?