[fixed]Mentor Mechanic

Describe the Bug:
The mentor mechanic allows an attacking creature to put a +1/+1 counter on another attacking creature who has lower power. However, both Boros Challenger and Legion Warboss do not actually trigger this effect. There is a "Fast Effects..." bit on their mechanic, but no part to select a creature to pump (attackers include Goblin token, and Swiftblade Vindicator).
Which update are you using? (date, name)Which type? (duel, gauntlet, sealed deck)
Manalink Dec 2021 update. Gauntlet.
What exactly should be the correct behavior/interaction?
The mechanic should work properly, allowing player to select another attacking creature to pump.
Are any other cards possibly affected by this bug?
Also tried Blade Instructor. Same issue.
The mentor mechanic allows an attacking creature to put a +1/+1 counter on another attacking creature who has lower power. However, both Boros Challenger and Legion Warboss do not actually trigger this effect. There is a "Fast Effects..." bit on their mechanic, but no part to select a creature to pump (attackers include Goblin token, and Swiftblade Vindicator).
Which update are you using? (date, name)Which type? (duel, gauntlet, sealed deck)
Manalink Dec 2021 update. Gauntlet.
What exactly should be the correct behavior/interaction?
The mechanic should work properly, allowing player to select another attacking creature to pump.
Are any other cards possibly affected by this bug?
Also tried Blade Instructor. Same issue.