Hugo extended edition required by default?

[Mateusz Łoskot]

I've read and learned this

gohugo-theme-ananke/README.md

Lines 275 to 277 in 91df000

 #### Custom CSS 
  
 WARNING: Pending resolution of this [discussion](https://github.com/theNewDynamic/gohugo-theme-ananke/discussions/452#discussioncomment-1865301), Custom CSS only works with Hugo Extended 

but using the latest

$ hugo version
hugo v0.123.8-5fed9c591b694f314e5939548e11cc3dcb79a79c linux/amd64 BuildDate=2024-03-07T13:14:42Z VendorInfo=gohugoio

and following the Hugo getting started tutorial together with

git submodule add https://github.com/budparr/gohugo-theme-ananke.git themes/ananke
echo 'theme = "ananke"' >> hugo.toml

I'm experiencing this:

Is this expected?

Replacing the standard Hugo with the extended Hugo fixes the problem, of course.