Here is some more information which may help the issue.
2 Screenshots - Left is live website / Right is test website
Screenshot 1 (NONE_AGGREGATION.jpg) - shows with aggregation set to NO - Results are the same on both screenshots
Screenshot 2 (AGGREGATION.jpg) - shows with aggregation set to Yes - Results are different, the live website (left) is the result we want but when we set aggregation to yes on test website with new version it shows no dates etc.
The end result should be it only shows 1 date when aggregation is set to yes but it shows nothing, and I am running the latest version of Drupal (8.7.3). I have had a drupal developer look at this and they cannot get it working either. If you can point me to someone who has it working with aggregation set to yes then that may help but at the moment aggregation is not working.
If you have any questions then please feel free to message me, if needed then you can have access to the test website to try to replicate the issue.
I have put this up once but was closed since you could not replicate the issue, as mentioned about you can have access to the test site is needed to replicate the issue.
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