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1
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v18.2.56 introduced error if a column has a filter property and a filterItemTemplate defined.  It seems this change introduced the issue.  This StackBlitz is a reproduction of the issue.

The console shows the following error:

zone-evergreen.js:364 ERROR TypeError: Converting circular structure to JSON
    --> starting at object with constructor 'TView'     | property 'blueprint' -> object with constructor 'LViewBlueprint'     --- index 1 closes the circle     at JSON.stringify ()     at ColumnsDirective.push.../../node_modules/@syncfusion/ej2-angular-base/src/complex-array-base.js.ArrayBase.isChanged (complex-array-base.js:147)     at ColumnsDirective.push.../../node_modules/@syncfusion/ej2-angular-base/src/complex-array-base.js.ArrayBase.ngAfterContentChecked (complex-array-base.js:202)