Ulduar combat issue (BUG)

Hy Blizz, i hope you see this post and try to fix the issue.
I tried to open a ticket, but it seems that someone very smart decided that it’s better to send players through tons of links and pages and deny their right to open the ticket (because after 30 min i still didn’t found how to make it), thing that in the past, back in the good days when Blizzard really cared about players, didn’t happened (i was pressing “open ticket” button, wrote my issue and after few hours received the fix). Now, getting over my ticket tantrum and frustration, here is the issue:

I tried today to do Ulduar raid for the achievements and a tiny chance for the mount. Everything was okay, i mounted my mount, started to fly towards Ulduar from old Dalaran, happy that i will do a ton of achievements, bla bla…when suddently, once i entered i realised what a big mistake was to come back to WoW and waste again money on a game that doesn’t care for it’s players.
So the problem is the following: once you start the combat, doesn’t matter with who, mobs or bosses, after you kill everything around you, you still remain in combat. I even killed everything, even the last small mob and still i couldn’t exit combat. The only available option was either to teleport back to Ogrimar or exit manually the raid and enter again. You can’t loot half of the bosses, because their loot is inside those boxes that can be opened ONLY if you are out of combat, you can’t use the teleporters inside the raid because they can be ONLY used outside combat…so in the end after wasting 2h and killing 5 bosses, i gaved up. I hope you do something to fix this issue. I am pretty sure this is a 8.3 issue, because before, when i played half a year ago, i did Ulduar without any issues.

I apologise for my “tantrum” behaviour, but i’m really pissed off. You literally destroyed this expansion in all aspects (gameplay, bugs, story, combat, mechanics, rng, farming, everything) and i wanted to give the game another chance, after almost 6 months of break and returned now just to be “bugged” in my first hours of playing. Obviously, as usual, you kept your “suicidal” path on making players quit the game again with this patch (8.3) and my only hope lies in the next expansion.
What-ever you do and what-ever choices you make, please think a lot and think carefully. Shadowlands is your last chance to revive this game. I entered today,wednesday, the day after reset, in peak hour (around 18:00 - 20:00 when usually everyone is on) and i barely saw 10 players in Zuldazar (and btw i play on Tarren Mill, one of the highest populated horde realms…at least this is what realm-pop says) . I qued for LFG raids and waited for almost 1h and in the end i gaved up. During Legion, beside the fact that the maps where full and i was frustrated that i can’t complete quests because of too many players farming the same mobs, when-ever i was pressing LFG button i never waited more than 1-2 minutes.
Listen to the community, improve the next expansion and try to be the old Blizzard, the Blizzard that we all loved and praised. Shadowlands is your last chance…don’t blow it up.