Earlier quoted context omitted.
Have you ever tried to customize or add functionality to Wordpress? Because if it’s anything like Drupal or other PHP based tech of a certain era, it’s hell
add_shortcode is incredible. It's probably my favorite part of wordpress, and writing a plugin is so easy, just a single file zipped up or scp'd. Especially with custom post types or adding a new table.
And now your page displays a white page. Error in the log is an exception with no stacktrace/location. This was my experience in production a few times.
It's a fun system if it works, but without a testing pipeline and a staging environment it's a lottery with a possible mystery breakage on every update/change.