fix Circular structure in calendar object #5332

Job	Run time
php8.1 on master integration tests	58s
php8.1 on stable28 integration tests	26s
php8.1 on master unit tests	31s
php8.2 on master integration tests	35s
php8.1 on stable28 unit tests	47s
php8.2 on stable28 integration tests	34s
php8.2 on master unit tests	36s
php8.3 on master integration tests	27s
php8.2 on stable28 unit tests	29s
php8.3 on stable28 integration tests	27s
php8.3 on master unit tests	41s
php8.0 on stable26 integration tests	2m 48s
php8.3 on stable28 unit tests	37s
php8.1 on stable27 integration tests	55s
php8.0 on stable26 unit tests	28s
php8.1 on stable27 unit tests	24s
php-test-summary	5s
	11m 48s

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