The relevant documentation for $id can be found here: https://json-schema.org/understanding-json-schema/structuring.html#using-id-with-ref

• Version: 1.43.0-insider (user setup)
• Commit: 17c6d12
• Date: 2020-02-28T12:46:02.355Z
• Electron: 7.1.11
• Chrome: 78.0.3904.130
• Node.js: 12.8.1
• V8: 7.8.279.23-electron.0
• OS: Windows_NT x64 10.0.18362

Steps to Reproduce:

This validates correctly using ajv@6.6.2.

Does this issue occur when all extensions are disabled?: Yes