But wait actually xd, i dont know how it worked, but folder name should be "AdvCiv" not "AdvCiv 1-11", well if it works i dont know, but i think your folder should be named "AdvCiv" not another name regardless of the version you use / want to play (be it 1.12, 1.11, 1.10, etc.)
Example of steam shortcut if i'm not mistaken (if helps too but anyways etc):
"C:\Program Files (x86)\Steam\steamapps\common\Sid Meier's Civilization IV Beyond the Sword\Beyond the Sword\Civ4BeyondSword.exe" mod=\AdvCiv
But again no idea if it weirdly works, just i'd advise to rename it properly to "AdvCiv" only for the version you want to play, and adjust your shortcut path as i showed as well to match this name, i'd recommend. But do as you see fit idk i mean if it just works xd, just seems safer or cleaner as such whatever that means but anyways etc
Edit: well if you mean that you're now using Advciv 1.12 as "AdvCiv" folder name, and that you renamed old AdvCiv 1.11 to "AdvCiv 1-11" (you dont use it i guess?), then it's all fine though, just if you're using AdvCiv 1-11 as your playing actually mod folder i'd suggest renaming it to "AdvCiv"

But do as you see fit idk i mean xd although seems to me it should be such but check if in doubt and if it works idk but anyways etc