Dependencies getting copied to private feed in Azure DevOps

I have set up a build pipeline for a model library that's shared between several of my projects. I'm accessing it through a private feed in Azure DevOps, and it works just fine. I can retrieve the library in Visual Studio and my projects all get the most up-to-date version. However, in the feed are all the dependency libraries used within the model library (e.g. Microsoft.Azure.Storage.Blob, System.Threading, Microsoft.AspNetCore, etc.). I haven't been able to find any guidance on why this is happening, if it's the expected behavior, or if I'm screwing something up. My YAML file for the build pipeline is below:

Also, does anyone know a better to handle package versioning? This seems really hacky, but it was the only way I could get auto-incrementing versions to work.

# Starter pipeline
# Start with a minimal pipeline that you can customize to build and deploy your code.
# Add steps that build, run tests, deploy, and more:
# https://aka.ms/yaml

name: $(projectName)-$(majorMinorVersion).$(semanticVersion)

pool:
  vmImage: 'windows-latest'

# pipeline variables
variables:
  majorMinorVersion: 1.1
  # semanticVersion counter is automatically incremented by one in each execution of pipeline
  # second parameter is seed value to reset to every time the referenced majorMinorVersion is changed
  semanticVersion: $[counter(variables['majorMinorVersion'], 0)]
  projectName: 'MyProject.Models'
  buildConfiguration: 'Release'
  projectPath: 'Shared/MyProject.Models.csproj'
  fullVersion: '$(majorMinorVersion).$(semanticVersion)'

steps:
# show version number on start
- task: Bash@3
  inputs:
    targetType: 'inline'
    script: |
      echo Building $(projectName)-$(fullVersion)

- task: DotNetCoreCLI@2
  inputs:
    command: 'pack'
    packagesToPack: $(projectPath)
    versioningScheme: 'byEnvVar'
    versionEnvVar: 'fullVersion'

- task: DotNetCoreCLI@2
  inputs:
    command: 'push'
    packagesToPush: '$(Build.ArtifactStagingDirectory)/MyProject.Models*.nupkg'
    nuGetFeedType: 'internal'
    publishVstsFeed: '<feed GUID>'