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

I have a Digimon that digivolved from a Tamer card. Can I use this card's effect to place a red level 4 or lower Digimon card from my hand at the bottom of one of my Digimon that digivolved from a Tamer card?
Yes, you can.
Ruled Mar 28, 2024
I use this card's effect to place a Digimon card under one of my Digimon that digivolved from a Tamer card. If <De Digivolve> causes that card to become a Tamer card again, what happens to the digivolution cards under it?
It remains stacked on top of the digivolution cards, but since it's no longer a Digimon, it can no longer activate inherited effects. If it digivolves back into a Digimon, it will be able to use inherited effects again.
Ruled Mar 28, 2024
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