Aw, geez. Now the railings are breaking physics too! Ah well, at least that one isn't really affecting anything- I'll just implement the patch and ship it with the next bugfix, along with that extra space. (Speaking of which- the fix has been fixed. There should no longer be watchtower-related softlocks or uncooperative ominous background sounds.)
As you likely guessed, there's no rockpiles being destroyed; the enemy in question is just burrowing out of the ground.
As for healed NPCs- the relevant quest involving this was implemented after the Daltah Mines were, but before the Quest Journal was a thing. The NPCs you healed will be counted in the total after you've spoken to a certain other character, and in the next fix/update, I could probably get the variable to update when opening the Quest Journal.
Thanks for being so patient. I really appreciate all the help!