As I have received no response from posting the problem at Source Linker Feedback group I decided to place it here. At first I thought this was just happening when adding sources from the 1901 collection, but later found it applies to the 1851 collection (and possibly others), too.

Here is an illustration - showing that Names are currently having to be added manually, although the Date and Place fields are being carried across, as expected.

Obviously a bug, so would be grateful if one of the mods could escalate to the engineers for a fix. Thanks.