Hi Ridwan;
1) As we have said in other threads you started on questions / issues on Webforms ... the Webform feature was no longer enhanced since PB 11.2. The last minor fixes / maintenance was done in PB 11.5. There was no further changes in PB 11.5.x, 12.x or 12.5.x to Webforms. The Webform feature was removed in PB 12.5.2 - so NO, there are no fixes to this problem.
2) My Canadian Government clients and I have developed many application prototypes in PB 11.x using Webforms. What we all found was that the Webform feature was riddled with problems since day#1. Very simple applications may work OK but anything more complicated usually ended up with either functional or performance issues. FWIW: Not one Webform application ever made it into production in the Canadian Federal government.
3) IMHO, Webforms was and is not ready for robust production applications. Even if you could get something basically working ... it will likely give you nothing but ongoing grief. I would recommend staying away from this technology.
Regards ... Chris