Fund: Overlapping cases in manifest don't err nor match

Describe the bug
environment.'case(os)'.'...' is ignored (doesn't match?) on Mac OS X.

To Reproduce
I want to build a crate with HEAD of gnatcoll-core. I do

Clone and pin:

git clone https://github.com/AdaCore/gnatcoll-core.git gnatcoll
cp -v gnatcoll.toml gnatcoll/alire.toml
alr pin gnatcoll --use=./gnatcoll

gnatcoll.toml has

[environment.'case(os)'.'...'.GPR_PROJECT_PATH]
prepend = "${CRATE_ROOT}/core:${CRATE_ROOT}/projects:${CRATE_ROOT}/minimal"

But alire doesn't take it into account on Mac OS (but does it on Linux AFAICS). On Linux I see

detail: Env: gnatcoll (env) prepends '/tmp/test/gnatcoll/core:/tmp/test/gnatcoll/projects:/tmp/test/gnatcoll/minimal' to 'GPR_PROJECT_PATH'

But I don't see this line in Mac OS logs. And GPR_PROJECT_PATH misses core, etc.

See Commit ae36a4e6b22070127db61c9a92df41a9385b16dc in my https://github.com/reznikmm/test repo (mac_env branch).

Expected Behavior
I want ... to match Mac OS.

alr version
2.0.1.

alr logs
See attached zip from GitHub CI (4_Do something.txt)
logs_26807299048.zip

Alire/alire