We can print multiple objects fine with the "All at Once" setting. The first layer looks great and everything is fine. I prefer the quality of printing each object one at a time. When I change and use the "One at a time" setting it seems to do a larger or double retraction so when it starts to print the second object there is no filament for a while. It does the same thing with or without a brim.
Here is a video of the transition to the new object. You can see the filament doesn't make it back to the nozzle until it makes it 1/2 way through the first layer.
Greg