I tried importing in Excel and it's the same, text is cut off.
However the Excel limitations are clear about this https://support.office.com/en-us/article/Excel-specifications-and-limits-16c69c74-3d6a-4aaf-ba35-e6eb276e8eaa
Could this be the same for PowerBI?
Power Query has the same specs as Power BI, with much larger "Maximum size of text in a preview cell", however this being an Excel plugin, how do they come up with that. The results are still limited to 32767 chars