Useful or not, from you.
angular Angular 9 throws exception by MatSelect

I am getting this error when i upgraded core.js:5828 ERROR TypeError: Cannot read property 'pipe' of undefined at MatSelect.ngAfterContentInit (select.js:678) at callHook (core.js:3892) at callHooks (core.js:3856) at executeInitAndCheckHooks (core.js:3797) at refreshView (core.js:11730) at refreshDynamicEmbeddedViews (core.js:13053) at refreshView (core.js:11711) at refreshDynamicEmbeddedViews (core.js:13053) at refreshView (core.js:11711) at refreshComponent (core.js:13128)

That's a useful answer
Without any help

please add example repo for reproduce and past correct template issue