Apparently two bugfixes didn't go through with the previous update push, namely:
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[*] Stairs leading down in the Secret Room entrance in Graveville continued being impassable.
[*] Wrong transfer event in Pandemonium Edifice secret room.
[/olist]
These (hopefully this time!) were fixed.
Extra fixes:
[list]
[*] Soul mother's quest would not show as completed in the Quest Log. Now fixed.
[*] Quest Log typo in quest: Lost Child was corrected.
[/list]
Thanks again to user scassy for everything.
Please, validate the game's file through the Steam Library to be sure that you are playing on the latest build.