ion-select delayed population fails to show selected item

Bug Report

Ionic version:

[x] 4.x

Current behavior: Setting the [(ngModel)] on an <ion-select> component fails when there is a ~55 ms or more delay between OnInit and the population of the various <ion-select-options> elements. This typically occurs when populating the values via an API call but it can be demonstrated with a simple delay. The correct option is selected but not shown. If you click on the drop down caret, the value instantly displays.

Expected behavior: The component should show the correct value.

Steps to reproduce: Introduce a 100ms delay between OnInit and populating the control.

Related code:

https://github.com/andleer/ionic4-select-bug/

// with delay, component fails to show selection
setTimeout(() => {
   this.widgets = this.pseudoApiSource;
}, 200);

Other information:

Ionic info:

 cli packages: (C:\Users\andrew\AppData\Roaming\npm\node_modules)

   @ionic/cli-utils  : 2.0.0-rc.3
   ionic (Ionic CLI) : 4.0.0-rc.3

System:

   NodeJS : v10.15.0
   npm    : 6.4.1
   OS     : Windows 10

[andleer]

Adding a 100ms delay after the “api” completes and then setting the selected value causes the selected text to be correctly displayed. Set the value earlier than about 50ms and the update seems to be lost. I have updated the example repo with this delay so it now correctly operates.

I also played with zone.run(() => ... ) and that didn’t seem to solve the issue.

setTimeout(() => {
  this.widgets3 = this.pseudoApiSource;
  console.log('widget 3 loaded');
  setTimeout(() => {
    // setting the value here after a delay of about 50ms or more
    // after the "api" call completes
    // causes the selected text to appear correctly.
    // remove the delay and just set the value at the end here
    // and the selected text will fail to display.
    this.selectedWidgetId = 4;
  }, 100);

I now think this is not about the delay driven by an API but rather the lack of a small delay beyond data binding in setting the value. Set it too soon and the selected text will not be updated.

[awadddq]

can i reback to ionic v3 ?