The rolling for loot takes longer to time out than the queue pop timer in LFR, causing you to have to wait for the chance at loot and abandon the queue, or take the queue and leave behind the loot.
This sucks.
I would propose switching LFR back to Personal Loot or not let the next queue pop until the timer expires on the final boss’ loot.
Your loot is not left behind.
If you win it gets mailed to you.
It is currently bugged to our knowledge, and yes, leaving does forfeit your right to the items.
People are literally waiting out the rolls specifically for this.
Are you sure? Multiple people have reported getting loot in the mail over the last few days.
Some players believe that if ppl leave after they rolled , their rolls won’t be counted.
Well I got bad news for them my priest got 3 loot, one of which is a weapon token mailed to her .
So their scummy thoughts can die .
I got loot to my mail from like 5 or 6 LFR runs so far, maybe you just didn’t win the rolls
It’s possible it was hotfixed, but they haven’t said it in the hotfix notes.
Nah its fixed , it just takes time to hit your mail box
People here have experienced getting their loot in the mail. I’ve seen screenshots of it. So where are you getting this from?
And there’s one.
Then can you please stop spreading misinformation? This is the second time now in a day.
Thats pretty sad
Especially since it’s incorrect information.
This is a misconception.
If you roll on loot, you can then leave the group and queue for the next LFR run. If you win the roll the loot will be sent to your mailbox.
It’s not misinformation.
There is just as many posts from people with evidence leaving skips your roll.
Until we get an official notfix note, both have proof of being true. Period.
What evidence? That they didnt get the item? How do you know they didnt lose the roll?
Could just be an RNG bug.
There’s a chance it forfeit’s loot, and a chance it doesn’t?
I’ve heard quite a few people say the same thing with the forfeit of loot thing, along with a large handful of my guildies - when we had our raid night in discord.
— However, as others suggested: It could have simply been hotfixed by now.
what eveidence ? that they didnt get loot --if they didnt win they wouldnt know what happened to thier roll
How would they know?
The tool only shows people still in the raid 2 rolls, yours and the winning roll
If your not in the raid you dont even see the rolls you just get loot in the mail when you win.
Personally I haven’t experienced it myself, but I also haven’t bothered to do LFR yet. 
— I’m just speaking off what others have told me, and to my knowledge of what others who have expressed it stated.
That being said on the same merit of your argument – How would they not know? We’d need a blue to comment on this thread to give some insight to whether it’s an actual bug, misconception people have rattled up in their anxieties (Most plausible case) — or perhaps formerly an issue that which was quickly rectified.
The fact that people are getting loot to the mailbox leans towards it either being patched or just being people forgetting that your not just rolling against 1-2 other players most items are rolled vs 8-10 people as its based on loot spec not role in the raid.
So just because for example there are 2 tanks and the trinket drops off sunking it wont just be the 2 tanks rolling its the tanks plus every healer and dps who switched to tank loot spec for that specific boss (which for dps is most of them with a tank spec as all the dps loot still drops for tanks on sunking).
Alot of this is people being surprised they didnt get an item thinking it was fairly uncontested but didnt consider people running offspec loot specs and it has since blown up to a full blown concern about what is actually just the system working very differently than the last round of group loot.
over 20 bosses done on multiple toons in LFR and not won anything , SL loot drops were bad -this is something else.
… tbh it just reinforces my decision to not buy the next expansion until its in the bargain bucket price range.