1 official ruling from Bandai. Straight answers to how this card actually resolves.

If my opponent has no Digimon in play but reveals a [ST8-06]/[Coredramon] from this card's security check, does this card check another Security card?
Yes, it gains <Security Attack +1> from its effect and updates its security attack value. You re-calculate its security attack and continue checking security based on its new security attack. (For more information see Attack Resolution)
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