URL slug doesn't change if I change collection name

[tpronk]

I once created a collection named "Thomas Epic Collection for Testing Taxila", used for early stage testing. Later on I renamed this collection to "Research Software Training NL" to use it for... well.... I guess you get it. However, I notice the slug didn't change. For illustration, see https://taxila.nl/collections/thomas-epic-collection-for-testing-taxila