[[_Toc_]] Doesn't Work in Vsts/Azure Devops Anymore

We use VSTS/Azure DevOps at work, and have recently updated all our README's and wiki's in our company to improve life for new starters and team switchers, and for general quality of life.

I've just noticed that the [[_TOC_]] element is suddenly very janky - only a few links work, whereas it linked beautifully a few weeks ago. IT still creates the table, but the table is pretty useless if only 10% of the items actually go to the expected view when you click on them.

Does anyone know what caused this, and if there's a fix? Should I raise a bug with Azure?

Thanks!