Using a spawn egg on a strider while aiming at lava spawns both a baby and an adult strider

Seems to be working just fine for me

Confirmed, make sure you're on lava. It also seems it doesn't happen every time.

it happened to me

Can confirm. This always happens if you would look at lava if the strider you're looking at wasn't there.

这不是bug这是我的世界本来就有的translation：It ’s not a bug, it ’s already in minecraft