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Just changing 

if velocity.x < 0: sprite.set_flip_h(true) 

else : sprite.set_flip_h(false)

to

if velocity.x < 0: sprite.set_flip_h(true) 

elif: velocity.x > 0: sprite.set_flip_h(false)


This caused me no issues in all of my testing, and only seems to be an issue in browser