The cause seems to be that when you upgrade to iOS 15.2 or higher, the Safari setting ``Prevent cross-site tracking'' is turned on.

▶Change settings
Home screen → "Settings" → "Safari" → "Privacy and Security" → Disable "Prevent cross-site tracking".
*Please turn it off at your own risk.

▶Change browser
Browse using a browser other than Safari.

▶View the calendar directly
Irodori's Google Calendar

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