Adding a bit of logs from data node:
{"t":{"$date":"2020-12-09T20:59:13.160+00:00"},"s":"I", "c":"SH_REFR", "id":24103, "ctx":"ConfigServerCatalogCacheLoader-14","msg":"Error refreshing cached collection","attr":{"namespace":"config.system.sessions","durationMillis":1,"error":"ConflictingOperationInProgress: No chunks were found for the collection"}}
{"t":{"$date":"2020-12-09T20:59:13.162+00:00"},"s":"I", "c":"SH_REFR", "id":24103, "ctx":"ConfigServerCatalogCacheLoader-14","msg":"Error refreshing cached collection","attr":{"namespace":"config.system.sessions","durationMillis":1,"error":"ConflictingOperationInProgress: No chunks were found for the collection"}}
{"t":{"$date":"2020-12-09T20:59:13.164+00:00"},"s":"I", "c":"SH_REFR", "id":24103, "ctx":"ConfigServerCatalogCacheLoader-14","msg":"Error refreshing cached collection","attr":{"namespace":"config.system.sessions","durationMillis":1,"error":"ConflictingOperationInProgress: No chunks were found for the collection"}}