RDP Dual Screen

We upgraded our Wyse 3040 to ThinOS 8.6. Configured by WMS 1.4.1.

They all have 2 screens.

Since then RDP recognises one large, spanned monitor instead of 2 monitors.
This is useless.

Does anybody knows how to prevent that, or do we have to go back to the old firmware?

Or is that solved in 9.0 ?

Thanks
Paul