How do I make my flying mob change when I step on the ground

Create a new mob, and in tick update use:

• If block at [x] [y - 1] [z] = air:
  • Despawn [event / target entity]
  • Summon [the previous mob] at [x] [y] [z]

In your previous mob, use:

• If not [block at [x] [y - 1] [z] = air]:
  • Despawn [event / target entity]
  • Summon [new mob] at [x] [y] [z]

Hopefully this helps!

I don't think it will let you do if not block at x y z, I don't know I haven't tried, but I don't think the two are compatible, a workaround, if I'm right, and you can't use the two together, would be this:

If [block at [x] [y-1] [z] = air then

         (Put a piece of code here that would do absolutely nothing)

else

        Summon [new mob] at [x] [y] [z]

        Despawn [event / target entity]

I mean not the block = air

keep in mind that the mob will also change when going up and down blocks

I accidentally wrote y instead of y + 1