Up until last year, the Bureau made available a separate table-shells file for each period, i.e. 1-, 3- and 5-year. Now there's a single file for all 3 (now 2) annual ACS releases.
Some of us use the table-shells file to control processing of the raw data. In my case at least, if the table-shells file contains tables/columns that don't exist in the data, there's a problem.
So, this isn't really a "fix", but a reversion to the earlier table shells format in order to match the data.