Uh oh, not another unreproducible bug... I'm so sorry for all the trouble.
I believe VIPCOOL might be planning to update his hold one more time. I will save my .dats before importing it. Which .dats will you need?
Also, I have no idea whether this makes a difference, but both
Below Witherwood and
The Infested Castle started as 3.0.0 holds. In the middle of the testing phase, I and both architects upgraded from 3.0.0 to 3.1.0.54. I wonder if the upgrade process is also needed to reproduce the bug.
In the case of
Below Witherwood, every time I imported a new version, Mines 1N3W became unconquered. In the case of
The Infested Castle, every time I import a new version, Tower 3: 1N1W becomes unconquered. I was thinking of posting my old 3.0.0 .dats, but realized they would be unhelpful, as those two secret rooms did change after I upgraded to 3.1.
Anyway, if this bug is related to the upgrade process, I don't think it's worth fixing after all. In a few weeks, everyone will be upgraded.