Ok this one have been driving us nuts for days and we looked real bad in a demo. Finally found it.
If you use the search widget to find a feature it finds it, highlights, and opens the popup which is great. BUT if you do Set as Analysis Input from that popup it fails every time saying no valid input. We see it on points polygons whatever. That exact same feature if you click on it get the popup then Set As Analysis input it works just fine. Select widget also it works fine. (also note the search result really needs an X here as there is no way to close it.
We can recreate this at all times with all tools.



Also note the running or stopped box at the bottom covers up the last tool run. Should be a little below that and not overlap.

I lost count of how many bugs the Analysis widget has now. Can we please get this bumped up the list to get this thing fixed up.
These are just mine but there are more. I am sorry but this is a bit out of hand. All of this worked in WAB - and WAB it took 2-3 less clicks. Its just super clunky. Please look at WAB as an example to how it was working.
https://community.esri.com/t5/arcgis-experience-builder-questions/more-analysis-widget-woes/m-p/1660577
https://community.esri.com/t5/arcgis-experience-builder-questions/select-widget-cannot-connect-to-analysis-widget/m-p/1626374
https://community.esri.com/t5/arcgis-experience-builder-ideas/analysis-widget-support-for-toolbox-categories/idi-p/1619071
https://community.esri.com/t5/arcgis-experience-builder-questions/analysis-widget-hanging-with-a-spinning-run-in/m-p/1647330
https://community.esri.com/t5/arcgis-experience-builder-ideas/analysis-widget-add-support-for-parameter/idi-p/1619080
https://community.esri.com/t5/arcgis-experience-builder-questions/analysis-widget-hoping-for-enabled-false-support/m-p/1617567
https://community.esri.com/t5/arcgis-experience-builder-questions/set-as-analysis-input-will-open-the-tool-if-its-in/m-p/1635671
Thank you very much!