Confused about Calendar and Contacts sync support with Google?

Describe the bug
I'm unsure whether microG is intended to support Calendar and Contacts sync with Google. From what I've found here:
https://github.com/microg/GmsCore/issues/705#issuecomment-464712729
and other places, then support is considered 'out of scope'. However, my calendar does sync, but contacts does not at all - but, the default contacts app in /e/OS look as if it should sync (it reports my Google account, as does the Google contacts app).

So, if calendar is working, is that intended - and are there plans - for contacts to work? Or, is it still 'out of scope'?

If it's not a bug that contacts do not sync, what's the recommended work-around for contacts: use DavX5 or the instructions under 3.1.1 here:
https://shadow53.com/archive/android/no-gapps/setup-guide/3/
and only following the procedure for contacts?

Thanks

To Reproduce
Steps to reproduce the behavior:

1. Install /e/OS
2. Try to sync with Google calendar and Google contacts

Expected behavior
Some indication of what microG intends (sorry, if that's under my nose somewhere)

System
Android Version: 9
Custom ROM:
https://leech.binbash.rocks:8008/e-os/pie//h815/e-0.17-p-20210607-CUSTOM-h815.zip
https://forum.xda-developers.com/t/rom-unofficial-p-f500-ls991-h81x-us991-vs986-e-os-bye-google-hello-privacy.4142021/post-83196371

Review the linked issue comment and the reported /e/OS Android 9 setup details first. Determine from the project's documented scope whether Google Calendar and Contacts synchronization is intended, and document the supported behavior or workaround; no source files or tests are identified in the issue.