Validation breaks when using anyOf or oneOf and the root schema has an $id

[nickgros]

Prerequisites

• I have read the documentation;
• In the case of a bug report, I understand that providing a SSCCE example is tremendously useful to the maintainers.
• Ideally, I'm providing a sample JSFiddle or a shared playground link demonstrating the issue.

Description

Both live validation and regular validation break if you supply a schema that has an $id and contains an anyOf or oneOf property.

It breaks the global AJV instance irreversibly, because the validator won't work in general for forms with the same $id that don't normally create this bug unless you refresh the page.

Steps to Reproduce

1. Add a schema with an $id and contains anyOf or oneOf
2. Validation no longer works

Expected behavior

Here's an example without the $id, and validation is working.

Actual behavior

Here's an example with the $id. Notice that validation no longer works. If you maintain the $id, the validator still won't work, even if you remove the anyOf field

Version

3.0.0. I think this bug also existed in 2.5

[nickgros]

Seems to have been fixed.