calendar event for iCal, Outlook broken

recently upgraded to Angular 12.x. Now events generated for Calendar (iCal) or Outlook are empty.
```
BEGIN:VCALENDAR
PRODID:-//Destination Search//ical4j 1.0//EN
VERSION:2.0
CALSCALE:GREGORIAN
X-MS-OLK-FORCEINSPECTOROPEN:true
METHOD:PUBLISH
BEGIN:VEVENT
URL:https://almacrae.comevent
```
Working properly for Google Calendar.