Unit-Test: Test_core_Get is not reliable

See: job-337140

Description

The test fails from time to time. Probably because it is not well defined.

Expected Behavior

Should be reliable

Actual Behavior

The test sometimes fails and sometimes succeeds.

Possible Fix

Steps to Reproduce

Context

Your Environment

• Version used:
• Environment name and version (e.g. go v1.16.3 on FreeBSD 13.0-current):
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