Found it:
from
https://community.victronenergy.com...plus-ii-2x-120v-doesnt-show-full-ac-load.html
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mvader (Victron Energy) ♦♦ cory cantrell · May 16 2021 at 12:11 PM
Hi, yes there is an update: its been looked into.
Conclusion: its 99% sure that we'll be able to make it show data for L2 as well with a firmware update. And its being worked on already, but I expect that this will take several months minimum before its fully finished and released.
Changes to a lot of parts are required, ie the firmware for both microcontrollers in the inverter/charger, and firmware in one, or perhaps even two parts in the GX device.
And then I haven't even mentioned VictronConnect, VRM and Venus OS Gui yet..
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I can't see that L2 passes through the MP-II battery monitor, so I would guess they're going to use the current on neutral to extrapolate L2.
In split phase, N only carries a current when the legs aren't equal. If you have 10A on L1 and 10A on L2, N is 0. 10A on L1 and 0A on L2, N is 10A. The problem I see with this idea is that 10A on N could mean L1 is 10A and L2 is 0A OR L2 is 20A.
They're talking about up to 4 firmware updates to make this happen, and "several months" likely means 2022.