Joomla 5.2.x - 5.3.0 + YOOTheme Pro: Only One or None Custom Fields Displayed – Debug Help Needed

[01Kuzma]

Hi everyone,

I’m struggling with Joomla custom fields not displaying correctly in YOOtheme Pro Builder on an old and fresh Joomla 5.3.0 installations with a multilingual setup. Only one field displays, and I need help identifying which files to debug to find the cause.

Problem Description:

I initially set up a fresh Joomla 5.2.x site (first copy) and worked on it, made some progress building a website with YOOtheme and configuring a multilingual site with two languages. Everything progressed well until I started using custom fields (CFs).
In the first copy, I created custom fields, but none were displayed in YOOtheme Pro Builder despite correct mapping and no errors.
Suspecting a configuration issue, I installed a second fresh Joomla 5.3.0 copy to start clean. I imported YOOtheme styles, set up two languages, and initially created one custom field for articles:
    Standard Joomla text fields.
    And the first text field displays as expected.

   Then  I created two additional CF: standard Joomla text fields +  One custom field from Tassos Custom Fields extension.

    The second text field and Tassos field do not display at all.
    I have a separate demo installation (localhost, non-multilingual (only the difference)), where all different custom fields work perfectly.

What I’ve Tried:

Verified fields are assigned to the article and set to language * or the correct language.
Cleared Joomla and YOOtheme caches.
Compared settings with the demo site, where all fields display correctly.

Question:

How can I debug why only one (or none) custom field displays while others are ignored?
Which files in Joomla should I inspect?

Additional Info:

Joomla Version: 5.3.0 (fresh install, second copy)
PHP Version: 8.1
Tassos Custom Fields
Multilingual Setup: Two languages configured (once standard, second custom language if that makes sense).

[HLeithner]

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