Clarify that Resource.duplicate(true) doesn't duplicate subresources inside Array or Dictionary properties

[AdriaandeJongh]

Partially addresses #74918 by documenting it. The issue has been bugging a lot of people for at least a year now, and with no fix in sight the documentation might as well mention it to save a lot of sweat and tears.

[AThousandShips]

I believe this is the way to go for this, even if we consider the current behavior a clear bug changing it without adding more options and complexity would IMO break compatibility with existing code. We can work further with improving the behavior (IMO by adding a flag for this), but I think the first step is to reduce confusion by adjusting the documentation to match reality

[Frozenfire92]

I think it would be worthwhile including a workaround as well like mentioned in this comment #74918 (comment)

[Mickeon]

The workaround is a bit too broad and non-exhaustive in my opinion. It has to be copied and pasted for every array/dictionary property. At the same time, anything more would be too verbose to fit the description.

[Frozenfire92]

@Mickeon Fair enough, I think I might try and play around with an editor warning for when this issue happens 🤔

[AThousandShips]

The wording looks good to me

[Calinou]

That reminds me, these property flags are currently not surfaced in the inspector tooltips or class reference in any way. We should find a way to do this somehow.

[akien-mga]

Thanks!