Steps to reproduce the issue

• Setup live site from 5.4-dev with disabling automated updates after installation
• Install plg_system_autoupdatepreventer plugin from #45696
• Installed 'System - Alpha Update Server' plugin from #45540
• Enable Auotmated Updates

Expected result

• Email with updated from current version to update version, e.g.
  Your site could not be updated from 5.4.0-alpha4-dev+pr.45696 to 5.4.112.

Actual result

• Email with updated from current version to current version, e.g.
  Your site could not be updated from 5.4.0-alpha4-dev+pr.45696 to 5.4.0-alpha4-dev+pr.45696.

System information (as much as possible)

Found in testing #45696

Additional comments