V13.11.0 broke Results.snapshot() of a collection of objects

[RedBeard0531]

Expected results

Prior to v13.11.0 calling Results.snapshot() on a Results from a collection of object would snapshot the results so that they would be usable even if the collection got deleted.

Actual Results

When you delete a collection accessing Results.size() fails, even if snapshot() was called prior to the deletion. This change was introduced by this commit.

Steps & Code to Reproduce

This change caused a failure in the realm-js tests. If the behavior change in core is correct, we can change the tests to reflect this, but we want to be sure that we aren't just papering over a user-facing breaking change in core.

Core version

Core version: v13.11.0