<component1 *ngIf="field != '' " //display component 1 if value is not empty
<component2 *ngIf="field == '' " //display component 2 if value is empty
<Mat-Select></Mat-select>
When a value is selected in the Mat-Select from component number 2, it automatically switches to display component number 1. This behavior seems strange to me because the value is supposed to be assigned to a different variable in another object within component2.
Did you consider using the strict comparison operator?
== checks for reference equality.
=== checks for value equality.
It is possible that this could be the cause of your problem.
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