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As stated both in src/GdiPlusFlat.h and src/bitmap-private.h the private definition of BitmapData used in libgdiplus does not match that of the MS GDI+ definition.
The library writes to the additional fields of the private definition even if it is unable to check which definition is being used by the caller. This can result in invalid writes (as shown in the testbits test).
Currently this issue is not hit in Mono because in BitmapData.cs the definition of the BitmapData structure is kept in sync with the one which is internal to libgdiplus, but it might be desirable to eventually fix this by making the structure match that of the MS definition. This would remove the need to special-case the use of libgdiplus in System.Drawing (vs the use of the original GDI+ lib).