libofx stopped working for me with non-ascii characters.
Example error messages:

LibOFX ERROR: OpenSP parser: otherError (misc parse error):
/tmp/libofxtmpoEFTsQ:48:39:E: non SGML character number 195
(Above message occurred on Line 48, Column 40)
LibOFX ERROR: OpenSP parser: otherError (misc parse error):
/tmp/libofxtmpoEFTsQ:48:40:E: non SGML character number 164
(Above message occurred on Line 48, Column 41)

This can be reproduced by using ofxdump or by attempting to import the file in Skrooge, which I use for my finances.
I assume gnucash and kmymoney will have the same issue.

My distro is Arch Linux, where this started happening in ~March 2022; identical files could be imported previously.
The AppImage for skrooge also seems to produce this issue, as does my wife's OpenSuse Tumbleweed system.

Example file with .txt extension so github allows it: ofx-broken.ofx.txt