Click on cache container -> Configuration -> Templates -> create new template -> fill in template name: newTemplate, base configuration: persistent-file-store-write-behind (template with file store and write-behind configured) -> next -> create

Result:
Pop up with error message:
{"WFLYCTL0062: Composite operation failed and was rolled back. Steps that failed:":{"Operation step-2":"WFLYCTL0216: Management resource '[\n (\"profile\" => \"clustered\"),\n (\"subsystem\" => \"datagrid-infinispan\"),\n (\"cache-container\" => \"clustered\"),\n (\"configurations\" => \"CONFIGURATIONS\"),\n (\"distributed-cache-configuration\" => \"new\"),\n (\"file-store\" => \"FILE_STORE\"),\n (\"write-behind\" => \"WRITE_BEHIND\")\n]' not found"}}

The new template is created, but configuration is not copied.