When both public version users and beta version users are present at the same time (or only public version users, though this has not yet been confirmed), opening the portal appears to cause it to disappear instantly from the perspective of public version users. I was unable to confirm this phenomenon myself, and since it only occurs for others, I was unable to identify the cause in detail. However, since this phenomenon has been reported by a significant number of people, it can be assumed that it does occur.

Translated with DeepL.com (free version)