Good evening Konrad and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
We are sorry to hear about the tickets not showing on your event page.
I would love to help you with this topic.
Based on your setup, I do not believe the cause is the same as the other thread you referenced to.
Would you mind providing me with a specific example of an event (URL) that does not display the tickets, but should ?
Please also include a screenshot of your “Edit ticket” section for that event.
If you selected a ticket start sale date, our plugin will not display tickets until the ticket start sale date is met.
Hang in there!
Geoff B.