Is there any info on this? We're seeing the brand slug get cleared in launches because the value isn't showing on the properties form, so when the properties are saved, it's being cleared and we're losing site branding every time a launch is promoted.

We've had to copy the brandSlugTuple.js from the Core Components clientlibs to the page clientlibs to get this field to populate in Launches and on the page properties page.

This is caused by a race condition on the brandSlugTuple.js
when

var checkboxFoundation = $brandSlugCheckbox.adaptTo("foundation-field");

is run... the checkbox still hasn't been initialized.. so the adapt returns an undefined object.

then, changeTextFieldState is called with enabled = false...

which means... this gets run..

            textfield.setDisabled(true);
            textfield.setValue(inheritedValue || "");

setting the textfield disabled and empty

Provided a fix for this in a Pull Request, for the issue that @paulochang mentioned.