6 official rulings from Bandai, last ruled Jan 10, 2025. Straight answers to how this card actually resolves.

If I activate this card's <All Turns> effect when multiples of my other Digimon with the [Royal Base] would leave the battle area at the same time by effects, are all of those Digimon prevented from leaving?
Yes, all of those Digimon are prevented from leaving. This card's <All Turns> effect affects all Digimon without having to choose them.
Ruled Nov 1, 2024
I have this card, BT19-053 [QueenBeemon], and another Digimon with the [Royal Base] in my battle area. My opponent uses BT5-110 [All Delete] and I activate this card's <All Turns> effect when multiples of my other Digimon would leave the battle area at the same time, and all of my other Digimon with the [Royal Base] are prevented from leaving. What happens if BT19-053 [QueenBeemon]'s <All Turns> effect activates afterward?
BT19-053 [QueenBeemon]'s <All Turns> effect places all of your Digimon with the [Royal Base] into your security stack. In such cases, this card's <All Turns> effect prevents all of your Digimon with the [Royal Base] from being deleted, but if BT19-053 [QueenBeemon]'s <All Turns> effect activates afterward, you can place all of your [Royal Base] Digimon that were affected by the deletion effect into your security stack.
Ruled Nov 1, 2024
What happens to cards placed face up in the security stack by effects?
They become face-up security cards that remain revealed. Other than rules that specify face-up security cards, the rules apply in the same manner as standard security cards.
Ruled Jan 10, 2025
What happens upon a security check for a security card that is placed face-up?
The check is performed with the card left revealed. Other than rules for cards left revealed, the rules apply in the same manner as standard security checks.
Ruled Jan 10, 2025
Does a card's <Security> effect trigger upon a security check with that card placed face-up?
Yes, it triggers.
Ruled Jan 10, 2025
What happens if I shuffle a security stack that includes security cards placed face-up?
Any face-up cards are placed face down, then you shuffle the cards. After shuffling, all cards are left face-down.
Ruled Jan 10, 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.