Check existance of `m_proxy_value` for references.

Theodore Changrequested to merge
1365-the-referencing-entries-are-not-shown-in-the-case-of-bidirectional-referencing into develop

Check existance of m_proxy_value for references as the criterion.

Use existance of m_proxy_value as the criterion of reference detection. Proxies will be automatically resolved which changes its type.

Changelog: Fixed

Closes #1365 (closed)

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