Odd discovery wrinkle in items imported from old version of DSpace

[sye...@gmail.com]

We're in the process of moving from a very old version of DSpace (1.8.2) to 6.3

We migrated a chunk of items using the command line export and import tools and by and large the migration went really well.

We're noticing an issue with discovery (but not with browsing): compare https://ir.wgtn.ac.nz/search-filter?field=author&filterorder=COUNT and

https://ir.wgtn.ac.nz/browse?type=author . The first has 174 items which match '|||' (although the link doesn't work) and the second has none.

It seems likely that this is related to the use of '||' as a separate between multiple authors in some metadata formats (such as the csv files), but I can't work our how to fix it.

cheers

stuart