On both current and release candidate the bridge does not show any tx traffic and it appears that ether1 is displaying the bridge tx traffic. I emailed support and provided a supout. Not sure if anyone else is seeing this as well.
Updated: Support says:
“This is expected on all devices, this is not a bug.
This is related to how the bridge interface works internally, but you should never look at the bridge interface to determine actual speed of data, always look at physical interfaces.”
So I guess its normal although it looks awkward.