Hash portion of URL lost during SSO redirect

It appears that private Pages sites under groups and/or projects with SSO enabled lose the hash portion of the URL during the SSO login/redirect.

Notice that redirects back to the application do appear to preserve the hash. For example, deep linking into a comment thread: https://gitlab.com/internal-handbook/internal-handbook.gitlab.io/-/issues/22#note_877040372

Compare this to the redirect that is performed when authenticating to a Pages site: https://internal-handbook.gitlab.io/company/KPIs/#product-kpis

If you are not already authenticated you will be redirected back to /company/KPIs/ without the hash.