Please Change Date Range for Groningen Currency

Under Low Countries, Feudal > Frisia, we currently have a currency for Groningen - Gulden (1420-1498).
However, there are several known examples of coins minted in Groningen bearing dates of 1499, 1507 and 1508 and in the same denominations as before 1498 (stuiver, half stuiver). For example: https://www.acsearch.info/search.html?id=1030664

In my opinion, this is most easily dealt with by extending the date range of this currency to 1536.

Concerning the history of this place, I can find this comment in the Britannica article on Groningen:
It passed to the duke of Gelderland in 1515 and to the emperor Charles V in 1536.
I am also aware that it was briefly under the control of the Count of East Friesland when the cons dated 1507-1508 were struck

This suggests to me a break between "Feudal" and Spanish Netherlands at 1536. But someone with a better understanding of the history here may also have a better idea.