I'm not entirely sure why this is happening but if I use overflow-x: auto; for the pre and code elements, Firefox ignores the padding on the right side of the code block if the content inside code overflows horizontally. Chromium does not seem to have this issue.
I found this discussion on GitHub going all the way back to 2016.
=> csswg-drafts: clarify padding in overflow content
Created: 2022-05-05
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