I think all the others that do this are loanwords from French? We keep the silent s at the end in the singular, and make it audible in the plural - faux pas, corps, précis, etc.

There are a bunch of other heteronyms, but I can't think of others that differ specifically in the plural

Excellent! And even stranger. In French, the singular and plural forms have the same pronunciation! Damned Rosbif can't do ANYTHING right. lol.

Corps. And you do have past and present of reading spelled the same and pronounced differently.

If you want to take the weirdness a step further, just look at the plural for "woman". When you write "women" you only change the second vowel, but when you pronounce that same word you only change the first.

It is a french word and it is inherently plural, sort of like pants, by my best guess, having only looked it up just now, singuler chassis would be a case.

So chassis, the thing full of parts, case, same thing but without the parts?