AEM Fiddle is not working on AEM 6.5.8

[d33t]

Fresh install on AEM 6.5.8 is leading to "Resource resolver is already closed" exception.

09.06.2021 17:41:34.549 *ERROR* [212.21.161.88 [1623260494545] POST /etc/acs-tools/aem-fiddle/_jcr_content.run.html HTTP/1.1] org.apache.sling.engine.impl.SlingRequestProcessorImpl service: Uncaught Throwable
java.lang.IllegalStateException: Resource resolver is already closed.
	at org.apache.sling.resourceresolver.impl.ResourceResolverImpl.checkClosed(ResourceResolverImpl.java:191) [org.apache.sling.resourceresolver:1.7.0]
	at org.apache.sling.resourceresolver.impl.ResourceResolverImpl.getResource(ResourceResolverImpl.java:442) [org.apache.sling.resourceresolver:1.7.0]
	at org.apache.sling.resourceresolver.impl.mapping.MapEntries.updateResource(MapEntries.java:288) [org.apache.sling.resourceresolver:1.7.0]
	at org.apache.sling.resourceresolver.impl.mapping.MapEntries.onChange(MapEntries.java:749) [org.apache.sling.resourceresolver:1.7.0]
	at org.apache.sling.resourceresolver.impl.observation.BasicObservationReporter.reportChanges(BasicObservationReporter.java:211) [org.apache.sling.resourceresolver:1.7.0]
	at org.apache.sling.resourceresolver.impl.observation.BasicObservationReporter.reportChanges(BasicObservationReporter.java:189) [org.apache.sling.resourceresolver:1.7.0]
	at com.adobe.acs.tools.fiddle.impl.FiddleResourceProviderImpl.refresh(FiddleResourceProviderImpl.java:108)
	at com.adobe.acs.tools.fiddle.impl.RunFiddleServlet.doPost(RunFiddleServlet.java:88)
	at org.apache.sling.api.servlets.SlingAllMethodsServlet.mayService(SlingAllMethodsServlet.java:146) [org.apache.sling.api:2.22.0]

Steps to reproduce:

1. Install AEM 6.5.8
2. Install latest version of acs-aem-tools (tested with 1.0.2)
3. Open /etc/acs-tools/aem-fiddle.html
4. Run default script