SafetyNet attestation check problems with MicroG Services Core app in /e/OS v1.12.3

/e/OS v1.12.3 on a3xelte (A10) as well as kebab (A12) and probably also on a lot of other devices:

There’s a problem with the new microG Services Core app (v 0.2.28.231657):

In the SafetyNet subpage of it’s configuration page the SafetyNet as well as the reCAPTCHA Test are incorrectly no longer offered.

Using YASNAC to check SafetyNet Attestation makes YASNAC crash after 2 handled test attempts after system startup. You have to wipe microG Services Core’s data or restart the system to get the next 2 test attempt abilities before YASNAC crashes again ... (This might be somehow caused by the (new) reCAPTCHA Enterprise Test implementation)

To get rid of this, I replaced the microG Services Core app of /e/OS v1.12.3 by it’s predecessor from /e/OS v1.11 (v 0.2.27.223616):

This restored the expected behavior and may be considered a workaround, but is of course no satisfying solution! ...