Resource at '/content/ka/events/_%5B2%5D.html' not found: No resource found (404)

The requested URL /content/ka/events/_%255B2%255D.html resulted in an error in org.apache.sling.servlets.resolver.internal.defaults.DefaultErrorHandlerServlet.

Request Progress:

      0 TIMER_START{Request Processing}
      1 COMMENT timer_end format is {<elapsed microseconds>,<timer name>} <optional message>
      5 LOG Method=GET, PathInfo=null
      6 TIMER_START{handleSecurity}
    887 TIMER_END{880,handleSecurity} authenticator org.apache.sling.auth.core.impl.SlingAuthenticator@248b6a8a returns true
   1130 TIMER_START{ResourceResolution}
   1472 TIMER_END{341,ResourceResolution} URI=/content/ka/events/_%255B2%255D.html resolves to Resource=NonExistingResource, path=/content/ka/events/_%5B2%5D.html
   1476 LOG Resource Path Info: SlingRequestPathInfo: path='/content/ka/events/_%5B2%5D.html', selectorString='null', extension='html', suffix='null'
   1476 TIMER_START{ServletResolution}
   1478 TIMER_START{resolveServlet(/content/ka/events/_%5B2%5D.html)}
   1709 TIMER_END{229,resolveServlet(/content/ka/events/_%5B2%5D.html)} Using servlet org.apache.sling.servlets.get.DefaultGetServlet
   1711 TIMER_END{234,ServletResolution} URI=/content/ka/events/_%255B2%255D.html handled by Servlet=org.apache.sling.servlets.get.DefaultGetServlet
   1714 LOG Applying Requestfilters
   1717 LOG Calling filter: com.composum.sling.nodes.mount.remote.RemoteRequestFilter
   1719 LOG Calling filter: org.apache.sling.i18n.impl.I18NFilter
   1721 LOG Calling filter: org.apache.sling.engine.impl.debug.RequestProgressTrackerLogFilter
   1723 LOG Applying Componentfilters
   1732 TIMER_START{org.apache.sling.servlets.get.DefaultGetServlet#0}
   1773 TIMER_END{40,org.apache.sling.servlets.get.DefaultGetServlet#0}
   1809 LOG Filter timing: filter=org.apache.sling.engine.impl.debug.RequestProgressTrackerLogFilter, inner=56, total=60, outer=4
   1818 LOG Filter timing: filter=org.apache.sling.i18n.impl.I18NFilter, inner=60, total=63, outer=3
   1855 LOG Applying Error filters
   1856 LOG Calling filter: org.apache.sling.i18n.impl.I18NFilter
   1860 TIMER_START{handleError:status=404}
   1979 TIMER_END{118,handleError:status=404} Using handler org.apache.sling.servlets.resolver.internal.defaults.DefaultErrorHandlerServlet
   2123 TIMER_END{2122,Request Processing} Dumping SlingRequestProgressTracker Entries

ApacheSling/2.8 (jetty/9.4.44.v20210927, OpenJDK 64-Bit Server VM 17.0.2, Linux 5.4.0 amd64)