Field refresh issue

We have added custom actions in Opportunity Details page. On click of custom action we are calling Custom list view. [Screen Shot 1]

We have got a “Save” button in the custom view, on click of Save button we are updating an opportunity. [Screen Shot 2].

We are updating opportunity stage on click of save button but when we navigate back to Opportunity details view stage is does not show the latest value.

We also confirmed that opportunity stage gets updated properly and when we navigate to the same opportunity one more time, it shows updates value.

We tried using below statements in load view but it doesn’t seemed working. [Screen Shot 3]

this.model.fetch();

Please help us to understand what we are missing out.