Unable to select previous APIM docs version & missing version history

Section `API Management REST API version history` is missing on this page: https://docs.microsoft.com/en-us/rest/api/apimanagement/apimanagementrest/api-management-rest#VersionHistory.

Is there some place it was moved to?

Besides, it is impossible to select any version, other than `2018-06-01-preview` on all reference pages ([e.g.](https://docs.microsoft.com/en-us/rest/api/apimanagement/api/listbytags)).
Is it the only supported version at the moment?

Start with the linked API Management REST API version history page and the `listbytags` reference page, comparing their version-history section and available version selector. Determine whether the missing history and unavailable previous versions are documentation defects, then confirm the expected supported versions before updating the affected reference documentation.

Written by the indexing model from the issue text.