using `resources:` field in `_quarto.yml`

Discussed in https://github.com/quarto-dev/quarto-cli/discussions/3763

^{Originally posted by ijlyttle December 26, 2022}
I am working on a PR for pins (rstudio/pins-r#692), and have gotten myself confused about how to use resources: in _quarto.yml. I don't know if I have found a bug, or if I am just doing it wrong. Hopefully someone can point me in the right direction.

I see this is discussed also in https://github.com/quarto-dev/quarto-cli/discussions/3443.

Here's my _quarto.yml file:

project:
  type: website
  resources:
    - data/board_one

resources:
  - data/board_two

board_one and board_two are directories; my goal is that they be copied recursively into _site/.

I find this works for board_two, even though this resources: isn't in the documented location.

However, for board_one, it copies the file in the folder, but not the folder inside. I get these warnings when I render locally:

WARNING: File 'data/board_one/mtcars/20221226T175420Z-c2702' was not found.
WARNING: File 'data/board_one/mtcars/20221226T175420Z-c2702/data.txt' was not found.
WARNING: File 'data/board_one/mtcars/20221226T175420Z-c2702/mtcars.json' was not found.

I have a (hopefully) reproducible repo, rendered and published with an action; here's the data directory.

I am using quarto 1.3.56.

Thanks!