"Join In Progress" Lets you leave DF Roulette without 30m Penalty

[IBNobody]

This bug was fixed in 2.28.

Problem:

Checking the "Join In Progress" checkbox lets you leave a brand-new Duty Finder Roulette instance without incurring the 30 minute penalty. (You can be one of the original four/eight party members and get this to work.) The duty can be left before or after the "Duty Commenced" words appear and the circle barricade drops away. This bug is being used by tanks to selectively leave instances of Halitali HM or Lost City of Amdapor in favor of getting Brayflox HM.

(EDIT: Removed the bug report info since SE has moved this to "Website Feedback & Suggestions".)

Steps:
1. Select "Join-In-Progress".
2. Select the Expert Duty Roulette.
3. Wait for a Join Duty window to appear. (The Duty should be new and not show a progress indicator.)
4. Enter the duty.
5. Wait for the cut-scene and skip it.
6. You can now leave the duty without the 30m penalty, even if the "Duty Commenced" message appears and the "circle" drops.
6a. Bring up the duty window.
6b. Select Leave.

The bug is tied to "Join-In-Progress". If you do not select "Join-In-Progress", you will receive the 30m penalty no matter how quickly you leave the duty.

This is referring to brand new duties, not already existing duties that are joined in progress.