Maps anyone recognize this structure?

[lathemandrel]

i am assuming this is the correct forum section lol

looking through some older files, i refound the screencaps of a structure that world gen made in one world from 2019. i couldn't then or now figure out exactly what it is or what made it. did use tmodloader, but don't think any of the mods i was using then affected world gen. any ideas?

mods; AlchemistNPC BossChecklist DisableCorruptionSpread DualWielding Luiafk ReducedGrinding (seems like that is all of them)

 

[prosans]

no

 

[Maza]

Red bricks, apparently.
They are crafted with clay blocks in a furnace.

 

[prosans]

oh

 

[lathemandrel]

definitely red brick, but i don't think red brick generates naturally at all, so i am guessing a mod did it. but why did they generate like that, and for what purpose?