Kernel only gives proper result when adding `@print()`

I'm experiencing a weird bug where the kernel I wrote only gives the expected result when I add a print statement in a particular place:

https://github.com/SouthEndMusic/SplineGrids.jl/blob/08f0e91a70c547e807b0a8bd89058b4cb8c06a43/src/spline_dimension.jl#L48-L70

It was suggested on Slack that it could be a synchronization issue, but the different threads are completely independent from eachother.

Start with src/spline_dimension.jl at the linked lines and reproduce the kernel with and without the added @print statement. Check whether the expected result remains consistent without the print, and use that comparison to determine whether the issue is synchronization-related.

Written by the indexing model from the issue text.