Add auto-tile feature in your game ( 16 Tiles or 48 Tiles ) for Construct 3 Runtime.
I don´t know if this is an issue that recently emerged but tiles cannot be drawn at x = 0 or y = 0. They just get ignored and left empty. I´ve dug through the code a bit and I cannot really tell why that would be happening. The arraymask is correctly set to true, but for some reason arraymsk[x][y] ends up beeing "false" right after. Really odd and I have no clue why that would be.
Hm strange.. but thank you, i'm looking into this next time :)