IDEX Misses Z moves

I star to test dual material printing but I encouter one issue.

I tried to print this minion but when there is tool change that has little to no outter walls the printer doesn't move on Z to make the layer change. It's strange because at the lower layers of the minion it's working fine.

I checked the gcode from OrcaSlicer and the layer change is there. It seams like the post processor is removing it or the printers is skipping it for some reason.

I had the same issue when trying to print two wall hollow cube with stripes however the issue was there even at lower layers.

This makes me think that it might be connected how many islands are there or layer time.

I'm attaching some previews and the gcode from Orca Slicer