Site keeps crashing with undefined function and odd .pgp extension from wp-settings.php

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I am currently working on a site and it’s crashing intermittently. In the debug.log, it shows an undefined function caused it.

The weird issue is that it’s a core WordPress function that is undefined and the wp-settings.php is trying to require a ‘.pgp’ file extension instead of the ‘.php’ file. There is nothing changed inside of the wp-settings.php file

The following has already been done:
– Malware Scan
– Reset SFTP/SSH password
– Reinstall WordPress
– Reset Salts
– Updated all plugins and themes
– Ran checksums on plugins and WordPress core
– Updated Server
– Enable object caching

The site requires PHP to be restarted to come back online. Although, the site 500s randomly, I can break it by continuously saving a custom taxonomy.

Has anyone ever experienced this? Or know why the wp-settings.php file would suddenly try to require a file by the wrong file extension?

Any help is appreciated.

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