CB Query Fields: Can't get Default to work on Query Drop Down

I've built a country selector following this tutorial . Works fine, except the 'Default' option seems to have no effect.

Illustrative example page .
Full backend CB config details at the end, but in brief:
CB > Fields > select_my_field > Global tab > Default: GB

I've checked for

• leading or trailing spaces around 'GB' in my CB config
• leading or trailing spaces in the option elements in the DOM
• It uses a simple 2-column country database pulled off the web. So, to eliminate that, I also switched temporarily to the one linked from the tutorial (made no difference).

__________________
This seems such a simple thing I can't believe it might be a bug. But I've also spent far too long trying to work out whether I've done something wrong.


My config:
Joomla 5.4.7
CB 2.11.0+build.2026.03.09.15.07.44.b34f2745a (latest as at time of posting)

Potentially relevant non-default CB settings

• CB > Field Management > cb_country > 
  • Global tab >
    • Type: Query Drop Down (single select)
    • Label: --- select country --- (I also tried empty string)
    • Show on Profile: No
    • Default Registration Value: GB (I also tried other country codes)
    • Size 1
  • Parameters tab
    • Query tab >
      • SELECT `iso`, `country` FROM `#__country_info` ORDER BY `country`
        • (I tried switching the order to country, iso and various other combinations)
    • Options tab >
      • Value Column: iso
      • Label Column: country

Hmm that should be working fine. Have added a bug ticket to investigate further. It's possible the default is trying to validate and apply before the query options have populated.

forge.joomlapolis.com/issues/9900

Validation is not enabled.

If it was I'd have listed it among all the non-default settings I gave.
That list is comprehensive. If anything is set at its default it will not be listed there.

I apologize I didn't mean field validation itself. What happens is the default registration value is validated against the list of available options before being set in the HTML. What I was saying is that likely isn't working against the query options. I'll be investigating that today to fix if I find an issue with it.

Thx. Understood

I was not able to confirm an issue with the field by itself. However you have the field inside of a field group. I was able to confirm the default doesn't work when it's inside of a field group. So looks like a CB Field Groups bug. Have added a bug ticket for that and am continuing investigation.

forge.joomlapolis.com/issues/9901