For some reason, I've pushed a theme via Git to Wordpress and since then (I am not 100% sure if it's because of that) I cannot see all the pages anymore. I can access them on the front-end and get the page code from inspect element, otherwise I can't edit those pages directly from Wordpress.

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Just apply the default Wordpress theme to check the current theme issue.
- Manish Negi
Can you please try by activating the default theme and check If it's working, then that will be theme issue. Otherwise some wordpress core files are changed. try to reinstall wordpress
- Tharunkumar