Those who are staying in the Netherlands on a short-stay visa and cannot leave the country can apply for an extension over the phone with IND. It is not necessary to have a sticker placed in your passport. The extension is only valid in the Netherlands and will be registered in the European Visa Information System (VIS).
You can keep the right of residence in the Netherlands even without a new residence document or sticker.
This situation is applicable till 28 April 2020, unless otherwise notified.
Read: https://ind.nl/en/news/Pages/Very-limited-service-at-IND-desks.aspx