The ColladaLoader::ConvertPath function does not work properly for certain files with special characters.
The offending code is at line 1452 of ColladaLoader.cpp (of the version 3.0 release).
Consider the following example:
%20 should be replaced with a space, but the ConvertPath function uses strtoul16 to convert the hex string to a number without limiting it to two characters. It then ands it with 0xFF and converts back to a string. So 2032 & 0xFF = '\32'.