Sls remove fails to remove Lambda's Cloudwatch loggroup

I have a very basic custom resource which invokes Lambda during a deployment. Everything works just fine but when I try to remove the stack, Cloudwatch loggroup for this particular Lambda function is not removed. If I don’t deploy custom resource, loggroup is removed as expected.

If I check this from the cloudformation events, it should be removed but it is not…

Is there something special related to this which I need to return as Cloudwatch Response Object that I am missing now?

var response = require('cfn-response');

.then(res => {
        return response.send(event, context, response.SUCCESS, {
        status: res.status