Tag_Control not working


I’ve tried to setup a tag control in a dialog to specify the LOB.
The tag should be a single value et required.

However, even though the drop down list works, it doesn’t select anything and prompt for error claiming that not value has been selected.
I’ve tried to not specify it as “required” but it doesn’t work either.

I’ve tried a drop down list named tag_0_lob and it works on Capablanca devel.
It doesn’t work though on Capablanca master.

Any idea?