Standard Bearer effect doesn't work

[MattiaBuffi]

Hi,

i'm testing my new Pauper decks against CPU, but Standard Bearer effect doesn't work, Basilisk gate effect target another creature even if bearer is in play.

[jeffwadsworth]

[[Standard Bearer]]

[github-actions]

Standard Bearer - (Gatherer) (Scryfall) (EDHREC)

{1}{W}
Creature — Human Flagbearer
1/1
While an opponent is choosing targets as part of casting a spell they control or activating an ability they control, that player must choose at least one Flagbearer on the battlefield if able.

[xenohedron]

This is most likely an AI peculiarity as the effect does work fine playing against another human.