3 official rulings from Bandai, last ruled Apr 4, 2025. Straight answers to how this card actually resolves.

What order do an effect that triggers when a card is removed from a security stack and a <Security> effect on a checked card activate when they trigger simultaneously upon a security check?
The <Security> effect will activate first. Upon a security check, a <Security> effect will immediately activate without pending activation.
Ruled Apr 4, 2025
A Digimon that has this card in its digivolution cards attacks, and a security check was performed on my opponent's security stack. If the attacking Digimon with this card in its digivolution cards digivolves into a Digimon with <Security Attack +1> using this card's inherited effect, is another security check performed?
Yes, another security check is performed.
Ruled Apr 4, 2025
I use a Digimon that has this card in its digivolution cards to perform a security check on my opponent's security stack, then I use this Digimon's inherited effect to digivolve into BT21-024 [Cyberdramon]. What card is trashed by BT21-024 [Cyberdramon]'s <When Digivolving> effect at such times?
The top card of the security stack. Upon a security check, the checked card is already considered to be removed from the security stack, therefore that card won't be trashed.
Ruled Apr 4, 2025
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Questions and answers are Bandai's official rulings, collected and translated by the DigimonCardGame Wiki community and reused here under CC BY-SA. Card names and card text are © their respective publishers; Combalo is not affiliated with Bandai.