Below is the answer of the technical support:
Thank you for reporting this issue and attaching the files.
I had a consultation with our Product Management team, and due to the Excel driver used when connecting to a data source, there is currently a limitation of characters in field width, which is 127 characters.
This limitation is by design, and given this information, I am going to move this case into a closed status.
Case details may be reviewed by visiting your Customer Portal:
This support case can always be re-opened by replying to this email. Doing so will mark the case as active, and I will happily pick up where we previously left off.
Please note that you can always open a new support incident and reference this support incident number should further assistance be needed at a later time.
Thank you for being a valued Tableau Software customer!