Split view separator doesn't remember its position

Hello!

Steps to reproduce:

1. Open a and b tabs in left hand view
2. Open 1 and 2 tabs in right hand view
3. Move split view separator as you like
4. Close Thunar
5. Open Thunar

The split view separator is always positioned in fixed position such that left hand view is less than right hand view. Screenshot:

Ideally, the separator position should be remembered.

thunar --version
thunar 4.17.3git-b3739cb8 (Xfce 4.16)