Performance hit for hinting NativeArray usage in Burst compiled Job?

My profiler is showing that a particular job set takes nearly 4ms in the Editor while normal profiling (using the Profiler class to sample) when my code looks like this:

Code (CSharp):

1.        
2.         [ReadOnly] public NativeArray<float> densities_batched;
3.         [ReadOnly] public NativeArray<int> blockIds_batched;
4.  
5.         [NativeDisableParallelForRestriction] public NativeArray<float> densities000;
6.         [NativeDisableParallelForRestriction] public NativeArray<int> blockIds000;
7.  

However, if my code looks like the following, that 4ms drops to nearly 0ms.

Code (CSharp):

1.      
2.         [NativeDisableContainerSafetyRestriction] public NativeArray<float> densities_batched;
3.         [NativeDisableContainerSafetyRestriction] public NativeArray<int> blockIds_batched;
4.  
5.         [NativeDisableContainerSafetyRestriction] public NativeArray<float> densities000;
6.         [NativeDisableContainerSafetyRestriction] public NativeArray<int> blockIds000;
7.  

Keep in mind, I'm scheduling ~100 IJobParallelFor jobs, each one depending on the last. Is the reason for the performance hit of scheduling due to the safety checks? Or is this a Unity bug? Should I expect these performance hits to be editor-only? Thanks.

edit: seems like its editor only, but its still a pretty huge hit in the editor and makes testing pretty frustrating.