First, this filter should be renamed "Date of First Performance (Annals)"
Sometimes this works and sometimes it does not, because some of the data is missing from records. I'm not sure why the data was only partially imported. If you compare a search for 1580-1582 on this field in the new site to one on the old site, for example, you will see several records appear on the old site but not on the new site.
Greg 92 at the Title level has no data in Date of First Performance
I believe the problem is that on the old site there were two relevant data tables. One is a display and the other was a filter field that was a date range, and any search that landed within that range would hit that record. It may be that these were not properly imported.
First, this filter should be renamed "Date of First Performance (Annals)"
Sometimes this works and sometimes it does not, because some of the data is missing from records. I'm not sure why the data was only partially imported. If you compare a search for 1580-1582 on this field in the new site to one on the old site, for example, you will see several records appear on the old site but not on the new site.
Greg 92 at the Title level has no data in Date of First Performance
I believe the problem is that on the old site there were two relevant data tables. One is a display and the other was a filter field that was a date range, and any search that landed within that range would hit that record. It may be that these were not properly imported.