Set scale to 0.75 works but it the next set scale (0.25) does work. It just gets destroyed.
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Each tick conditions are checked and events runs from top to bottom... so your sprite is scaled to 0.75 each tick (if conditions are always true)... scale to 0.25 works but you can't see it and 0.4sec after 1st time conditions are true, the sprite is destroyed
https://www.scirra.com/manual/75/how-events-work