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Thank you, there is indeed an outdated version of Apache on the hosting. The problem is solved.
[Wed Feb 28 02:28:18.426312 2024] [core:alert] [pid 2027057] [client 2.74.5.39:50804] /var/www/user/data/www/site.com/.htaccess: Invalid command 'CGIPassAuth', perhaps misspelled or defined by a module not included in the server configuration, referer:
When deleting "CGIPassAuth On", the site loads perfectly.