Failed tests for paragraphs translations

In entity_reference_revisions issue #2673076-27: Investigate loading pattern of field_collection it's mentioned that with provided patch paragraphs tests are failing.

I have investigated problem a bit deeper and I have found that tests ware failing also without the patch.
Next step was manual testing of the test procedure, where I copied test code in a separate script and execute it => and I got expected results.
That led to the conclusion that some internal storage caching could be a problem.

In the end, it was entity storage cache, where simple invalidation for testing relevant entity IDs was sufficient.