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Geoff
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Based on the comments:

  • generic template works, but custom does not

  • custom template overrides visibility rules

I would surmise that the problem is with the visibility, since the conditional field is likely only hidden, and not actually being removed - this would cause the code to execute every time, while in a standard render() it would remain hidden

Using [Devel][1] and specifically the dpm() function, I would find the element in the field array that manages the visibility of the field and use that as the basis for the if statement.

A suite of modules containing fun for module developers and themers [1]: https://www.drupal.org/project/devel

Geoff
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