If there is a #region directive within a partial class, it may cause errors during a merge.

[Shiling1234]

partial class classA { #region testRegion int a =1; #endRegion }

partial class classA { #region region2 int b=1; #endregion }

after merge, will cause #region count and #endregion count not match

If classA has an inner class, the result of the merge may create an additional outer inner class.