Notes from the Html.Keyed on how keyed works:

A keyed node helps optimize cases where children are getting added, moved, removed, etc. Common examples include:

• The user can delete items from a list.
• The user can create new items in a list.
• You can sort a list based on name or date or whatever.

When you use a keyed node, every child is paired with a string identifier. This makes it possible for the underlying diffing algorithm to reuse nodes more efficiently.

This means if a key is changed between renders, then the diffing step will be skipped and the node will be forced to rerender.