Nano icons will occasionally not appear on the Academy build
and its not only problem for me, i asked other players and same problem
It might be worth trying to send a sP_FE2CL_REP_RELOAD_CHAR packet after the first sP_CL2FE_REQ_PC_LOADING_COMPLETE. I wouldn't be surprised if this is what the original game did to work around potential race conditions surrounding resizing the nano array.
The aNanoBank and aNanoSlots fields in sP_FE2CL_REP_RELOAD_CHAR appear to be ignored by the client. I don't actually think we need more than our existing sendNanoBookSubset() function; moving the call to after (or during) handling of sP_CL2FE_REQ_PC_LOADING_COMPLETE as you suggested might be the right move.
I don't think we can be sure what the right solution is until we fully understand why this race condition is happening in the first place; I'll dig into the client code and see if I can root cause the issue.
Actually, this bug seems to have 100% repro if the client manages to processes P_FE2CL_REP_NANO_BOOK_SUBSET after loading in, so the solution seems to be reliably getting that packet over before sending P_FE2CL_REP_PC_ENTER_SUCC.. investigating