Cargo doc fails for certain crates in a workspace with "no such file or directory (os error 2)"

Problem

I'm working with a few other people on making a programming language in Rust and we've encountered an error in trying to create documentation for our workspace.

This is what we get:

 Documenting chrono v0.4.33
error: failed to render source code for `crates/syntax/src/lib.rs`: "crates/syntax/src/lib.rs": No such file or directory (os error 2)
  --> crates/syntax/src/lib.rs:1:1
   |
1  | / use std::mem;
2  | |
3  | | pub type SyntaxBuilder = eventree::SyntaxBuilder<TreeConfig>;
4  | | pub type SyntaxElement = eventree::SyntaxElement<TreeConfig>;
...  |
96 | |     Error,
97 | | }
   | |_^

 Documenting unicode-normalization v0.1.22
 Documenting itertools v0.13.0
error: could not document `syntax`
warning: build failed, waiting for other jobs to finish...

It's really confusing as it gives no other information.

I've seen other similar-ish issues here but they seem more like cargo itself couldn't be found whereas this is saying that crates/syntax/src/lib.rs couldn't be found (when it exists and the command even shows the contents of the file)

Steps

1. git clone https://github.com/capy-language/capy
2. cargo doc
3. see error

Possible Solution(s)

No response

Notes

rustup update hasn't helped, and this error is replicable on my team member's machine

Version

cargo 1.79.0 (ffa9cf99a 2024-06-03)
release: 1.79.0
commit-hash: ffa9cf99a594e59032757403d4c780b46dc2c43a
commit-date: 2024-06-03
host: aarch64-apple-darwin
libgit2: 1.7.2 (sys:0.18.3 vendored)
libcurl: 8.4.0 (sys:0.4.72+curl-8.6.0 system ssl:(SecureTransport) LibreSSL/3.3.6)
ssl: OpenSSL 1.1.1w  11 Sep 2023
os: Mac OS 14.3.1 [64-bit]

Clone https://github.com/capy-language/capy and run cargo doc using the reported Cargo 1.79.0 environment to reproduce the missing-file error. Start by tracing how Cargo documents workspace crates and renders source paths; done means explaining the cause and making documentation generation complete successfully for the reported workspace.