Applying propertie '.becomesRemoved' to an issue

Hello, community!
I'm trying to figure out the "issue.becomesRemoved" - it is necessary to send a Request to a third-party API when deleting an Issue. The following code does nothing and does not return:
 

const entities = require('@jetbrains/youtrack-scripting-api/entities');
const workflow = require('@jetbrains/youtrack-scripting-api/workflow');
const conn = require('helpers/connect');
exports.rule = entities.Issue.onChange({
 title: 'Delete event from third party service',
 guard: (ctx) => {
   return ctx.issue.becomesRemoved;
 },
 action: (ctx) => {
   const issue = ctx.issue;
   let idevent = issue.fields.IDevent; // Field in the task
if (issue.becomesRemoved) {
   const connCal = conn.connCal();
   const respCal = connCal.deleteSync(/ ... uri from api ... /' + idevent, null);
 } 
},
 requirements: {
   IDevent: {
     type: entities.Field.stringType,
   }
 }
});

Is it possible to implement it in this way? And how?
Thanks!