Missing methods in few versions of /resource-manager/Microsoft.ContainerRegistry/stable/xxx/containerregistry.json

Hello,

I started off having an issue in using ContainerRegistry with the ruby-sdk.
https://github.com/Azure/azure-sdk-for-ruby/issues/2804

After some research I think the the rest-api-specs lack a few methods for versions in between.
E.g. this search lists the versions having the method I'm looking for however few API versions don't.

https://github.com/Azure/azure-rest-api-specs/search?q=%22lists+all+the+container+registries+under+the+specified+resource%22

Although I can point the ruby-sdk to a specific version, I'm still wondering if those methods shouldn't be available anyway.

Start with the resource-manager/Microsoft.ContainerRegistry/stable/xxx/containerregistry.json files and compare the API versions identified by the linked search. Check which versions omit the referenced container-registry method, then confirm the affected specifications consistently expose the intended methods across those versions.

Written by the indexing model from the issue text.