Hi there, I have already posted my ticket to the WotLK beta forums but I'm also posting here because this bug is also affecting the 2.4.3 live client so I hope both dev teams could have a look on it.

Bug is posted here: http://forums.worldofwarcraft.com/thread.html?topicId=9023657322&postId=90227870945&sid=2003#0 but I will copy and paste it below if it's broken:

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Q u o t e:

Hi, I have found a bug in live and wotlk client:

Client: Tested on 2.4.3 and 3.0
Language: frFR
Step to reproduce:

1) Disable all addons
2) Enter in a PvE instance like the Jail in Stormwind
3) Type /dnd This is a DND test message.
4) Leave the instance
5) Notice <DND> flag is automatically removed near your name
6) Notice the reply of UnitIsDND("player") is empty so you are technically NOT DND (at this point still no bug)
7) Type /w <your character name> test
8) Notice you are auto-replying the DND message previously set "This is a DND test message." without being in a DND mode

Expected output:
Step 8) is failing, the expected output is just a copy of our whisp but not the reason previously set when we were DND into the instance.

Results:
People that have used "/dnd reason" into an instance will continue spamming the "reason" even outside the instance and without a DND flag activated, also problematic when using an addon managing DND flags automatically

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Q u o t e:
Hi Merah.

Thanks for the report. I have submitted the information to the developers for review, and I also confirmed the problem was valid before doing so. Thanks once more for your vigilance, and be sure that a resolution will be looked for and rolled out over a future content update as and when it's available. :)

Xaldavan.

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Glad you investigated it and confirmed it so quickly and thanks again to you for inviting mod authors to the beta, that's a pleasure to help making such great game even better.