How do I make player fall off solid block when not solid?

Hey all. I am having issues with using a player sprite with the platform behavior and a solid block in a sidescroller. An event triggers while the player is on the solid block causing it to no longer become solid and have them fall off of said block. However, the player does not respond to this change, staying on the now not-solid block or having several seconds of lag before falling. Is there a way to fix this so that the player falls immediately when the block is no longer solid while they are on it? (I am wondering if this is a collision check issue)

Thanks!

Threr are many methods - 2 of which are:

Add another action to the one that disables solid that moves the player 1 pixel at angle 270.

Disable collisions for the platform.