Hi Muhammad,
you can bepass this limitation if you create the needed VLAN manually or with ONE-Policy. Just overwrite the dynamic VLAn with a "permanent" VLAN. Then you are able to manually assign port this this VLAN by command.
Unfortunatelly i do not know 100% if this is FAD or if this is just a function based on a bug in currently EXOS 22.5 / 22.6.
But it works fine.