The tooltip for Trial Omen and Raid Omen when applied on a potion are blue instead of the negative red.
/give @p potion[potion_contents={custom_effects:[{id:"minecraft:trial_omen"}]}] 1
The effect was negative.
The effect was positive.
MC-84661 Glowing is considered a positive effect in potion item tooltips
MC-170462 Bad Omen is considered a positive effect in potion item tooltips