Use greater or equal on the condition
PS.: Your object's speed depends on the fps, therefore, on the performance, use delta time to make it independent. (Look for 'Delta-time and framerate independence' at the manual)
Sorry it does not work.
With dt it does not detects at all.
Using a sprite for collision noes not work because it's not pixel precise.
The greater or equal condition creates an infinity of tiles, if you put trigger once while true it does not work at all.
I don't really care of the speed. I want the tiles to spawn when the blue tile touches its y position at 774 with a speed of 9 pixels per tick It must be pixel precise or there will be gaps.
For me it's a bug