Reported by @tonurics on Arch Linux bugtracker (FS#69253).

To clarify, assume you have zip file called "foo.zip" containing one item: "readme.txt"
Taking the same file above and instead using switch e [to extract to the working directory, i.e 7z e foo.zip], one of two things will happen [depending on the zip file]: sometimes 7z creates a file named "IBM437.so" with the contents of "readme.txt".

Seeing IBM437 makes me think of c104127...

Note: Arch Linux already switched to your p7zip fork and is providing 17.03 in the official repository.