England: Does the Renters' Rights Act 2026 void an existing break clause?

I have an AST in England signed before 1 May 2026. It has a break clause says:

"The Tenant and Landlord shall have the right at any time to give not less than two (2) month's written notice to terminate the Tenancy."

My landlord says the Renters' Rights Act 2026 makes this clause void.

For example, if I give notice on 2 June, under the agreed break clause I would expect to be able to end the tenancy on 2 August. But under the new rules, I understand I may have to stay until 30 August, adding almost another month.

The existing break clause does not say that notice must align with the rent payment date.

Does the new Act really invalidate the existing break clause, and does the new notice requirement have to align with the rent payment date?

Any legal guidance or relevant sources would be appreciated.