Pressing Cancel in UI does not restore the original value of field

[aldisa]

I am using a BeforeSave hook to validate/process edits made in the front-end.

Here is the sequence of events:

I click on the detail field pencil icon to start editing a field.
After entering new value, I click on <Update> button.
The back-end rejects the edit with an Error exception as follows:

// generate UI error message
throw Error::createWithBody(
  $error->getMessage(),
  Body::create('Update Error: ' . $error->getMessage())->encode()
);
​ 

The error is shown in UI and the edit does not complete.
At this point the new value is in the field input still in edit mode.
I click on the <Cancel> button.
The field does NOT revert to the original value.
If I refresh the page, now the field shows the original value since edit was never saved.

Shouldn't the UI restore the original value in this situation?

[yuri]

Will be fixed in v8.3.2.

[aldisa]

Thank you yuri.

I have a related question.

I have custom entity = MyEntity.
This entity has a relationship to the Contact entity labeled as "Specialist Assigned".
I have custom AfterUnrelate hook.

The user unrelates a contact using detail edit:

When the user clicks on "X" to remove the Contact, and then clicks "Update", this will fire my AfterUnrelate hook.
In my hook, I perform some validations, and is some circumstances, I may clear the values in other fields in MyEntity.

However, in the UI those fields will have previous values since the hook was triggered with a detail edit.
Is there anyway for the hook (backend code) to trigger a model sync and view reRender so that the altered values are updated in the view?