It goes from there being no portal at all to an open one changing to the readying state instantly after you press the open button. Also I think there should be a one second delay with a ring of particles around the edge of the frame before the readying animation fully starts so you have some time to get back and look at it.
#The realm portal's animation glitches if you close then open the portal
quick wyvern
I'm calling the state where it spawns monsters while setting things up serverside the readying state.