stronghold, curtain walls "unbuilt"

[Tulostin]

both of my built curtain walls have been "unbuilt" after auto resolving an attack on my stronghold

[LadyCrimson]

both of my built curtain walls have been "unbuilt" after auto resolving an attack on my stronghold

Pretty sure that would not be a bug - you auto-resolved a battle, and during the "battle" enemies damaged your Stronghold. Intended consequence.

 

P.S. consequences during auto-resolving battles seems random. Most of the time at least one of your buildings or defense structures are knocked out (and you'd have to rebuild). Occasionally you get lucky and it doesn't happen.