Can an AIMesh node "consolidate" 4x4 bandwidth to 2x2 or can it only forward half of what it receives to a 2x2 client?

Kind of a weird question, but I hope it's clear what I'm asking. Let's say I have two RT-AC86Us set up as an AIMesh router and node. There is no dedicated backhaul band, so the node is basically a repeater. They both have 4x4 5 GHz ac radios. Now let's say I have a 2x2 phone connected to the node. Is the phone only receiving 2 forwarded spatial streams, or can the node "reformat" the data that it receives from the main router via its 4x4 radio and give the phone that full bandwidth via 2x2...

Can an AIMesh node "consolidate" 4x4 bandwidth to 2x2 or can it only forward half of what it receives to a 2x2 client?