Regarding changes made for #1923

If I run

rebar3 path

These won't be included (the goto example here would be a rebar.config with this dependency here)

{opentelemetry_api_experimental, {git_subdir, "http://github.com/open-telemetry/opentelemetry-erlang", {tag, "1.0.0"}, "apps/opentelemetry_api_experimental"}},

This is because much like in #2424, paths is calculated without going through the 'usual' mechanisms because that would be too slow.

ebin_dirs(Apps, State) ->
    lists:flatmap(fun(App) -> [io_lib:format("~ts/~ts/ebin", [rebar_dir:checkouts_out_dir(State), App]),
                               io_lib:format("~ts/~ts/ebin", [rebar_dir:deps_dir(State), App]) ] end, Apps).
priv_dirs(Apps, State) ->

Etc.

Sticking this issue up as a statement of intent, as a PR will be coming shortly. I suspect the right solution will be more band-aidy stuff of 'be aware of git-subdirs and get them into this path structure without incurring further build dependencies'