Possible bug - loop freezes in C3 Runtime but works in C2 Runtime

Hi- can someone check my work.

This came up in a utility I am building, and I recreated the problem in a simpler .c3p.

I am running a 2D loop to check the state of tiles in a tileset.

If you run in debug mode, you can see that the loop stops for no reason when using C3 runtime.

Change to C2 runtime and there is no problem.

Link to the file here:

dropbox.com/s/kjddqdnqsz3haia/Runtime%20Freeze%20example.c3p