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Hi there @DanielAlejandro,
It looks like that the 404 page works as expected when visiting a plain page:
https://sequential.design/?p=12
However, you need to choose the permalinks setting for your website (can be found in Settings > Permalinks) so that they not set to Plain.
Let me know how it goes. Regards, Bobby
As I stated in my question, “I should mention that enabling pretty permalinks gets rid of this issue, but I want to use ugly permalinks.”
I want to use plain permalinks. And I want nonexistent URLs to redirect to WordPress’s 404 page. Thus your solution is inadequate. I want 404s to work with plain permalinks.