I was just thinking, this could be an encoding issue when downloading certain files.
I have mentioned a possible workaround for this here with some screenshots: 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. This should go in-between the GUNZIP and Parse JSON module.
Alternatively, you can simply try toString(data) in your Parse JSON module’s JSON field.