We are working with a client and are using Fuzzy Group transform for de-duping, and hierarchy creation for a national account list.

I've found that if a large number of pass through columns are sent to the Fuzzy Grouping transforms it randomly corrupts the char columns.

Our work around was to only pass through ID columns and then build out the attributes needed from views against the Fuzzy group output however product team should take a look at this.
By corruption I mean random characters from other records would show up in character columns (we had address and name corruption in about 10% of a 1.5 million record dataset).

Thanks.

Michael Slater
Software Architects