10 official rulings from Bandai, last ruled Mar 28, 2024. Straight answers to how this card actually resolves.

This card has two [When Digivolving] effects. If I resolve [When Attacking] first, do I resolve the other [When Digivolved] effect after finishing the attack?
No. If you activate the [When Attacking] effect or the [When Digivolving] effect [When your Digimon attacks] first, the other [When Digivolved] effect will be activated before the Counter timing.
Ruled May 25, 2023
I use this Digimon's <When Digivolving> effect to place a level 3 Digimon card at the top of its digivolution cards. This Digimon is then targeted with a <De Digivolve 2> effect. What happens?
The <De Digivolve> effect trashes this card, and the Digimon becomes a level 3 Digimon. <De Digivolve> can't be used to trash any more cards once the Digimon it's targeting becomes level 3, and the effect ends. Any digivolution cards placed below it remain, and their inherited effects can still be activated.
Ruled Mar 28, 2024
This card has 2 <When Digivolving> effects. If <Blitz> resolves first, does the other <When Digivolving> effect resolve after the attack ends?
No. If you activate <Blitz> first, after activating any <When Attacking> or [When a Digimon attacks] effects, you activate the other <When Digivolving> effect before the reaction timing occurs.
Ruled Mar 28, 2024
I digivolve a level 5 Digimon into this card. Can I place a red level 4 or lower Digimon card or level 7 Digimon card from my hand at the top of this card's digivolution cards?
Yes, you can.
Ruled Mar 28, 2024
I use this card's <When Digivolving> effect to place [BT5-017]/[ZeigGreymon] at the top of its digivolution cards. If I then activate <Blitz> and attack, can I use [BT5-017]/[ZeigGreymon]'s inherited effect to attack an opponent's unsuspended Digimon?
Yes, you can. [BT5-017]/[ZeigGreymon]'s inherited effect allows you to attack an opponent's unsuspended Digimon.
Ruled Mar 28, 2024
I use this Digimon's <When Digivolving> effect to place a level 3 Digimon card at the top of its digivolution cards. This Digimon is then targeted with a <De Digivolve 1> effect, trashing this card. What happens to the Digimon?
It becomes a level 3 Digimon. The digivolution cards placed below it remain, and their inherited effects can still be activated.
Ruled Mar 28, 2024
With the [When Digivolving] effect of this card, I put "BT5-017 ZeigGreymon" on the top of the digivolution card. After that, if I activate the [Advance] effect and attack, can I attack the opponent's Digimon in the active state with the digivolution source effect of "BT5-017 ZeigGreymon"?
Yes, the digivolution card effect of "BT5-017 ZeigGreymon" can attack Digimon in active state.
When a Lv.5 Digimon digivolved into this Digimon, can I put a red Lv.4 or lower or Lv.7 Digimon card from my hand on top of the digivolved card?
Yes, it is possible.
With this Digimon's [When Digivolving] effect, I placed a Lv.3 Digimon card on top of the first Digivolution card. If this Digimon then receives the effect and this card is trashed, what happens to the Digimon?
It will be a Lv.3 Digimon. The digivolution card that was under it will remain stacked, and the digivolution card can still activate the inherited effect.
With this Digimon's [When Digivolving] effect, I placed a Lv.3 Digimon card on top of the first Digivolution card. After that, when this Digimon receives the effect, how is it handled?
≪The effect of causes this card to be trashed and become a Lv.3 Digimon. ≪Since cannot be further trashed, ends there. The digivolution card remains stacked and the inherited effect can be activated.
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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.