Normally, I can just upload the MP3 file into the WordPress media library, then Add it to a post like this one.
However, for the past few months, every time an MP3 is uploaded into the WordPress Media Library, it is shortened or truncated at random lengths.
I have no idea why. There were no updates done that I’m aware of. I’ve tried many different mp3s, different computers, different browsers. The MP3 should be 51:19 long.

Here is the exact same file uploaded 3 times in a row, as an example:

In troubleshooting mode with all Plugins “Disabled”: