Welcome to the Make community!
The problem is the encoding issue when downloading certain files.
I have mentioned a possible workaround for this here: Read text in .txt file stored in google drive - #4 by samliew
You can use a “Convert encoding” module using the same input and output encoding, then you can use the output of this module in your Parse JSON module.
Alternatively, you can simply try using the toString built-in function in the mapped field, something like this: toString(data)