The problem is in olivero_preprocess_node. The code overwrites $variables['date'] with just a date. Previously the value was set by template_preprocess_node() and it contains rendered field output.
There is a clear requirement to customise the date format for a particular theme. However the current solution is probably not the right way to do it. Ideas:
NodeDisplayConfigurableTest.phpNeeds work
10.1 ✨
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Updated the IS - I believe this is not only about quickedit.
Without this, there aren't really any core themes available to test the node date field. This would be a problem, except that the testing (that I spent some time writing) seems to have been deleted from Core anyway see 📌 Reinstate important testing NodeDisplayConfigurableTest Active - great work.