Check and fix properties for sideeffects

[OsirisTerje]

We have observed unwanted side effects in #4994. We should also ensure that properties - in particular in the area of classes concerned with expressions and constraints, to NOT have side effects.

If any is found, they should be fixed-

[manfred-brands]

The offending properties are the ones needed to build complex constraints: And, Or, With and Instead
We cannot remove these properties and until we can make an Immutable version of the ConstraintBuilder we cannot modify them.

But there is an attribute we can use to tell the debugger not to evaluate it.