Issue Update trigger missing information

Hi, I’m listening for an issue update to find when comments are being deleted. I get the trigger but the change log information is incorrect. The from is stringified json (which doesn’t have the comment text) and the from fromStr is null

"changelog":{
      "id":"10517",
      "items":[
         {
            "field":"Comment",
            "fieldtype":"jira",
            "fieldId":"comment",
            "from":"{\"id\":\"ari:cloud:jira:4676d566-32b7-419e-b4b4-e1c7c0f20bd6:comment/10012\",\"version\":\"2\"}",
            "fromString":null,
            "to":null,
            "toString":null
         }
      ]
   }

How do I get the text of the deleted comment text?