[citeprog bug] cite-group-delimiter and year-suffix

To reproduce:
Use the style for the Journal of Peace Research
which has collapse="year-suffix" cite-group-delimiter=", "
and <layout prefix="(" suffix=")" delimiter="; ">

Test with any two items from the same author and year (e.g. a simple duplicate).
Expected: (Smith 1776a, b)
Actual: (Smith 1776a; b)

Oddly, this does seem to work correctly with collapse="year"
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