Rules is able to navigate the entity reference items within a Primary Entity Reference field by field delta, but there's no named way to navigate the primary reference itself.
In the field's `preSave()`, the items are sorted by whether they have the primary bool set (presumably so that delta 0 contains the primary), but presumably this can't be relied upon in all circumstances as the field item list could have already been modified against that convention by the time code/Rules is interacting with it.
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