Combobox/Multiselect: valueNormalizer breaks on second error observable

[dummdidumm]

I'm submitting a...

• Bug report

Current behavior

When the observable handed to valueNormalizer throws, the input is ignored. This works as expected and is documented accordingly. However, if the observable throws a second time, the dropdowns break.

Expected behavior

valueNormalizer should handle all error observables.

Minimal reproduction of the problem with instructions

Multiselect

1. Go to https://www.telerik.com/kendo-angular-ui/components/dropdowns/multiselect/custom-values/
2. Open Stackblitz of last section "handling errors"
3. Enter a custom value into the multiselect -> input is ignored as expected
4. Enter a custom value one more time -> input gets through

Combobox

1. Go to https://www.telerik.com/kendo-angular-ui/components/dropdowns/combobox/custom-values/
2. Open Stackblitz of last section "handling errors"
3. Enter a custom value into the combobox -> input is ignored as expected
4. Enter a custom value one more time -> endless spinner, there is an error in the console

For both dropdowns, there also sometimes pops up the Angular "ExpressionChangedAfterItHasBeenCheckedError: Expression has changed after it was checked"-error.

Browser:

Affects all Browsers

[dimitar-pechev]

The fix is shipped in v3.3.0 of the @progress/kendo-angular-dropdowns package.