I will spend some time today trying to duplicate this.
It may have to do with prior config set-up. So I will prep a server by loading the UGC 6's config, then run a HL lobby. I re-iterate that no changes have been done to my servers in at least 2 weeks, so all of the configs and whitelists are where they were in the past when this worked correctly.
Most servers run tf2true can we just add a command to exec it with tf2true aswell just as a backup? I do not know reading logs and what to look for like you do which is why a bug report is made.
The standard UGC configs already run tftrue.
This is what I found in ugc_HL_base.cfg
//Item Whitelist
mp_tournament_whitelist "cfg/item_whitelist_ugc_HL.txt"
tftrue_whitelist_id "item_whitelist_ugc_HL"
http://logs.tf/1291993
https://tf2center.com/lobbies/648605
https://tf2center.com/log/648605
http://larpmingle.co...os/l0221002.log
The steps done to reproduce the bug:
1. Log in to server, exec ugc 6's config
2. Start a NA HL lobby UGC, mumble.
3. Upon joining, 6's whitelist still in effect
4. fix is to exec the UGC config
(log entries start around 02/28/2016 - 08:40:37)