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Sorry to hear you’re facing problems 
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Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.2.3): 22.2.3
Operating system and version : CentOS 7.9 (NethServer 7)
Apache or nginx version: Server version: Apache/2.4.6 (CentOS)
PHP version : rh-php73 php-7.3.29 7.3.29-1.el7
The issue you are facing: When logged in using Chrome (or derivative) browser, opening a clanadar item from the Dashboard widget opens a new tab, but indefinately is trying to open te calandar item. Popups are enabled for the website. No extra extensions installed.
Is this the first time you’ve seen this error? (Y/N): Y, but reproducable on multiple systems
Steps to replicate it:
- Log into nextcloud using Chrome(ium)
- Click on Agenda Item from Dashboard (upcoming activities widget)
3.New tab opens and times out
The problem does NOT occur using Firefox
When going to the agenda, then opening the item, a popup opens and can be edited.
Any suggestions?