My latest upgrade to LibreOfficePortable 220.127.116.11 has corrupted my bullet lists: The characters have changed to different symbols.
I discovered, that the default symbols obviously come from the open symbol font, which I could find in a path among the other font files.
Then I tried to register open symbol in windows and this fixed it: my usual bullets were back!
Unfortunately, registering components in windows isn't the idea of portable software and wasn't necessary in the past...
Regards from Germany!