[BUG] Reusable workflows cannot call adjacent actions?

I have a composite action I’m working on that needs two steps to operate: discover the envs/matrix of the tool it wraps and then, create a job matrix from that output. To prevent the need for the users to properly call these two components, I’m trying to wrap them in a reusable workflow.
But when I do uses: ./, it does not detect the action in the repository. It’d be nice to be able to do this.