It looks like the "search" page is the one with the issue. I tried adding ?showsource to the end of my search page url, and at the end after doing a search, but it just refreshes the page.
When I click on Show Source in an event, a url similiar to this shows up briefly before going to the OOPS page:
https://mysplunk/en-US/app/myapp/show_source?sid=1586985134.55214_B1086B2C-C090-4409-B71D-B9F32EA5CDAB&offset=0&latest_time=
Adding ?showsource to that link just directs to the OOPS page. Some of our "search" dashboards are broken too, but adding ?showsource just redirects to the OOPS page as well.
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