Does weapon mastery work with a spell attack action

Cantrip spell such as True Strike, Green Flame Blade and Booming Blade that require a weapon as part of the spell, does weapon master come into play?

Example 2024 Arcane Trickster, main hand short sword and off hand scimitar.

Use a magic action to cast true strike.  Can we use Nick / Vex to move our off hand attack w/ advantage  to the magic action or does Nick/Vex not come into play and off hand attack stays as a bonus action because the action was "magic" rather than "attack"

Maybe a way to ask this question is, does Weapon Mastery Properties still activate when a weapon a PC has an active mastery in is a component of a spell during a Magic Action?

Just for completeness and to provide more interaction examples, here are some related posts:

• True Strike and Weapon Masteries - Rules & Game Mechanics
• 2024 Weapon Mastery and Two-weapon Fighting with Weapon-based Cantrips - Rules & Game Mechanics
• Shadow Blade - Rules & Game Mechanics