The only suggestion I have are:
1 - add an ARP/MAC mapping for each IRB. Some thing like
setinterfaces irb unit 50 family inet arp 10.244.6.41 l2-interface ae0.0 mac e8:b6:c2:7f:37:e3; (ARP/MAC is the peer)
2 - if #1 does not solve it, then maybe config some mc-ae interface? Maybe needed for ICL/ICCP to work right???
I assume the interfaces are up (both physical and L3) - do you see anything being passed like LLDP? I also assume LACP is up and good as well.
Good luck