When increasing the size of an array (of class) in the inspector, the constructor for the array member is called, but then the value is deserialised (not sure from where) causing all the fields to go to zero.

Reproducible on 5.2, 5.3, 5.4

This is discussed in several threads, for example:

http://answers.unity3d.com/questions/600150/initialization-of-classes-instatiated-in-an-array.html

Repro steps:

1) Open attached project "39037.zip"
2) Open "main" scene
3) On the ScriptHolder object increase the size of "My Array" from 1 to 2
4) Observe the new element has defaulted values of 0,0 instead of the expected 1,2

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Postponed:
Fixing this requires us to change the way array elements are initialized and call ctors on them in the editor.

The risk with this issue is that we would be calling code in the ctors that we have never called before and this could cause unwanted side-effects in user projects. Fixing this issue is going to create potentially much more issues. Postponing to improve this behaviour in the future.