Spark Double triggers when face down (copying Koma)

[JohnPetfield]

[[Spark Double]] copying [[Koma, Cosmos Serpent]] then [[Ixidron]] turns both of them face down. Koma doesn't trigger, however Spark Double is triggering and creating the tokens.

[github-actions]

Spark Double - (Gatherer) (Scryfall) (EDHREC)

{3}{U}
Creature — Illusion
0/0
You may have Spark Double enter the battlefield as a copy of a creature or planeswalker you control, except it enters with an additional +1/+1 counter on it if it's a creature, it enters with an additional loyalty counter on it if it's a planeswalker, and it isn't legendary if that permanent is legendary.

Koma, Cosmos Serpent - (Gatherer) (Scryfall) (EDHREC)

{3}{G}{G}{U}{U}
Legendary Creature — Serpent
6/6
This spell can't be countered.
At the beginning of each upkeep, create a 3/3 blue Serpent creature token named Koma's Coil.
Sacrifice another Serpent: Choose one —
• Tap target permanent. Its activated abilities can't be activated this turn.
• Koma, Cosmos Serpent gains indestructible until end of turn.

Ixidron - (Gatherer) (Scryfall) (EDHREC)

{3}{U}{U}
Creature — Illusion
/
As Ixidron enters the battlefield, turn all other nontoken creatures face down. (They're 2/2 creatures.)
Ixidron's power and toughness are each equal to the number of face-down creatures on the battlefield.