pcity->client.collecting_info_units_supported is created only for controlling connection, as it depends on request id from packet_processing_started.
Patches for all branches, including S2_6.
main/S3_2 get mandatory network protocol change, npf branches optional one.
On S3_0 and S3_1 this leaves the case where new client connects to old server a bit unsatisfactory. But as there's no regression there (only that the fix does not apply to all cases it could), and it's too late to rework this before 3.1.0-beta2, leaving that part to a new ticket -> #48046
Observing an S3_0 HEAD + 3.0.5 targeted patches autogame there's packhand.c "pcity->client.collecting_info_units_supported != NULL" assert failures (and similar ones for "..._present")
Likely related to the fact that I'm observing single player.