APEX

This has me baffled. This code generates an invalid URL for a modal page:

   v_url := APEX_PAGE.GET_URL (p_application => '250',
                               p_page => '4'
   apex_debug.message('URL: '||v_url);         

It generates

URL: #action$a-dialog-chain?url=fFpD250A4A16067681742932AAYES6p_dialog_csD7FNKQG53K3ymJ3CZCt_mFsoy67OE-JIcHSK6yPF1YB-mL7GYwsizsx0g2eWuruRZo7lxig8ZYXuQD7rXLZagZg&modal=true&appId=250&pageId=4&title=

which returns error:

Action not supported 'a-dialog-chain'

when using this generated URL (stored in pData) in:

apex.navigation.dialog(pData,{} );

Note: if the modal page is not chained, the generated URL uses a-dialog-open, which does work.

This looks like a bug to me.