2d array can't be read and write in 1.5.0, keeping complaining nullref inside the getter method

In MelonLoader 0.7.1(using il2cppinterop 1.5.0), all il2cpp 2d arrays cannot be accessible at all
I was trying to read and write a 2d array, but to my surprise, System.NullReferenceException was thrown in the getter method. I was even unable to do a non-null check of it.
In MelonLoader 0.7.0(using il2cppinterop 1.4.6) it worked very well, but in 0.7.1 it kept throwing exception.

[ds5678]

Multi-dimensional arrays are planned for v2.