The problem appeared because not all of the `realOverridden` have been
collected because inside AbstractSerializableListDecorator some of the
scopes returned the same instance as direct overridden and after that
overridden tree traversal stopped without detecting real overrides.
Thus, the modality of intersection for
AbstractSerializableListDecorator::size and MutableSet::size
was incorrectly computed to ABSTRACT
The similar thing is already done at the place where we're obtaining
all overrides.
See https://github.com/JetBrains/kotlin/commit/c80cfb0fdb00323ba9b5e1dd98c5cbd0bfab6b8b#diff-182d90c9b8050557e4e2eb319a84b9a51fd0600c728dd0fce85cf6491c13e16dR152
^KT-57693 Fixed
Denis.Zharkov