Yup… the implementation is not great to be fair. When I “add to calendar” I always copy the URL for the post and paste in the calendar description so that I can quickly go back to the post to get the Meet details when it becomes available.
Also, sometimes the Meet details don’t show correctly in the link given by the meet-up page (possibly a user error when the host submitted the link) so it comes up with an error when you click on the link. In some instances, you can right click on the link and copy the link address, paste it in a notepad/text editor/URL address bar… scroll through the pasted text and you’ll come across the Meet address embedded in the text.
Here’s an example where the link in the meet-up is not showing properly.