Sorting order isn't updated automatically

Under "View - Arrange - By modification date", when files are updated (e.g. by being edited or re-downloaded), they don't get automatically reordered (like they did in older Thunar versions).

Version information

4.21.6-dev-0b5c2820

Steps to reproduce

1. Open /tmp in a Thunar tab.
2. Set View->Arrange Items->By Modification Date.
3. Run in terminal (in /tmp): touch 1.txt.
4. Run in terminal (in /tmp): touch 2.txt.
5. Run in terminal (in /tmp): touch 1.txt.

Current behavior

Unless refreshing manually (e.g. with F5), 2.txt is still ordered as newer than 1.txt. Even though after the second "touch" we can see (in the status line by pointing at "1.txt") that it's newer than "2.txt".

Expected outcome

After the second touch 1.txt, that file "1.txt" should be reordered in Thunar automatically as newer than "2.txt".