I am currently working on a migrated 2019-farm. Migration was 2010->2013->2016->2019 in one flow.
Now, I find the old
CoreResultsWebPart not showing any results at all. Search is working fine and if I remove the
CoreResultsWebPart and replace by using the new
ResultScriptWebPart results are displayed.
Is it possible that the old
CoreResultsWebPart is not working at all in 2019?