Eden-DAoC

lvl 25 ice pet used
cast aoe stat debuff on ice pet - wait for resist - pet doesn't go melee and keeps casting
https://streamable.com/1yyrnc - test
https://gyazo.com/d379ddaa28015fb6abc7bde8a792ce26 worse qual gif but u can see it in a fight here

my understanding is that ice pet should go melee if it resists a debuff like aoe s/c from sm?

Since 1.90, pets follows interrupt logic of players (kind of), as stat debuffs, as a rule, do not interrupt players (resisted or not) it does not interrupt pets either.