Reproduction Steps:
1. Import attached project.
2. Build and Run scene "ExampleB".
3. Inspect build's output_log.

Expected result: There should be no errors, like when ExampleA is built.
Actual result: Error in output_log:
A script behaviour (probably ChildB?) has a different serialization layout when loading. (Read 32 bytes but expected 36 bytes)
Did you #ifdef UNITY_EDITOR a section of your serialized properties in any of your scripts?

Reproducible with: 5.5.4f1, 5.6.2p2, 2017.1.0f3, 2017.2.0b1.

If have both inheritance ways with ifdefs both inside parents and children just in case, each in its own scene to build each time. See how the one with the generic type, produces the above error.