Your reported problem is already a known issue at our end, and it has been fixed with our last patch release version of (v20.3.0.53). So, upgrade to the latest (i.e., v20.3.0.53) to resolve this issue. Please follow the below steps to update the packages,
1. Delete the @Syncfusion folder from node_modules and the package-lock.json file from the root folder.
2. Clear npm cache at your end.
3. Run the ‘’npm install” command to install the node_modules.
Note: Make sure to install @syncfusion/ej2-angular-base package with the version 20.3.53 to have the fix included package.
You can download a working sample from the link below.