Metal Fill in Encounter Digital Implementation

Hello all,

I created a big multiplexer with Cadence Encounter and it has 4 metal layers. And to avoid some MTOP DRC error I filled the Top layer with metal dummies (rectangular dummies in Metal 4 connected to GND or floating).

But when I import tge GDSII in Cadence Virtuoso, all the layers and standard cells are present except the dummies I created in Cadence Encounter. I don't know why the dummies are not present because these dummies are just rectangular shapes in Metal 4.

Many thanks, 

Yoann