When an entity is being diagrammed, and has an entity reference using a View filter, the reference is not drawn or shown at all.
The difficulty is that the field does not know what entity or bundles are being surfaced by the View.
There are two possible solutions. (One considerably harder than the other)
A) (lighter lift) Have a bubble appear on the diagram that represents the View and shows the name of the View.
B) Dig into the View and try to surface what entity type and bundle(s) are being surfaced by the View.
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