Mouser, this all just reporting CHS treatment of vector clips --
summary: it appears to work correctly but still saves duplicates.
Testing with Inkscape 0.92.4 (5da689c313, 2019-01-14)
- With Clipboard Trigger Copy Delay set to 400ms, two clips get copied (1 x Ctrl+v).
- With the same vector drawing and delay set to 500ms -- one clip gets copied.
Also note:
Clips remain duplicated (setting is to update clip)
All clips appear identical when pasted:

The only difference in blob info is time taken for the queries. One clip is 0.01kb smaller, other two same size. All have different hashes.
Mouser
I cant find where to compare blob info -- you say under the view menu never mind it's under Tools menu. Can I actually compare two clips in this 'Interrogator' --
IIUC I can compare the clip that is selected in the main CHS window and the current clipboard clip.
Here the difference between two of those duplicated clips shown above (they both paste correctly):

- One seems to have much less formats (?)
- Both appear to have a PNG -- this is not shown in the CHS 'Memo' pane
- EDIT// note the blob info of both of these clips is the same in the CHS memo pane -- apart from the milliseconds taken for each step