[1.2.5] Infinite Dungeon Floor 30, no stairs down

[MoloMowChow]

I started a new Infinite Dungeon campaign (in exploration mode) and made it to floor 30. In that floor were one of those 3 pillar doombringer summoning events, and a vault containing orcs. I cleared both, with there being a boss orc on that floor that dropped the Orb of Many ways.

After soon after clearing that vault, I was told there was nowhere left to explore. I dug tunnels searching or cut off rooms but found none on the black sections of the map.

Is this a bug or am I supposed to use the orb of many ways somehow? I see no portals anywhere. Is there any way to force progress to the next floor since I don't want to start over?

[MoloMowChow]

I realized it's probably hard to pinpoint the bug (if it is one) without a save file, so I'm uploading the zip containing the character now.

I can't use the forum uploader due to the filesize limit. and I don't know any other simpler public file uploaders so I hope mediafire is okay...
http://www.mediafire.com/?gpuxkv394rq23u2
If you want a different means of obtaining the save file I'm willing to compromise.

I haven't dug every single diggable tile yet but I have dug tunnels to confirm there is no secret rooms anywhere...

EDIT:
Other things to note was, at the time, the Bearscape event then the Snowscape event both activated for this save while online. I eventually found the bearscape portal some earlier floor. I died a few times in there but I was able to clear it eventually and return to the infinite dungeon floor I was on.
Not sure if this might have caused problems since I hear event dungeons and infinite dungeons didn't get along in the past...