Is fqcn[action] behavior ok in this case or is it a bug?

[staticdev]

I have a role repo with 2 defined ansible modules in the folder library: firefox_profile and firefox_addon.

When I call it on tasks I just put their names since it is not part of a collection. But I get the warnings:

fqcn[action]: Use FQCN for module actions, such `<namespace>.<collection>.firefox_profile`. (warning)
tasks/configure_profile.yml:2 Action `firefox_profile` is not FQCN.

fqcn[action]: Use FQCN for module actions, such `<namespace>.<collection>.firefox_addon`. (warning)
tasks/configure_profile.yml:10 Action `firefox_addon` is not FQCN.

Is it a bug? If not, I did not find clear in the documentation how should I name the namespace.collection?