Undoing changes to Default Style Sheet does not show change until editor refresh

Steps to reproduce:

1. Open a Unity Project
2. Create a new Text GameObject via GameObject > UI > Text - TextMeshPro
3. If prompted, import TMP Essential Resources
4. Set your text to be <Style="H1">Test Text</Style>
5. Observe that the H1 style has been applied to the Test Text
6. Select the 'Default Style Sheet.asset' in Assets/TextMesh Pro/Resources/Style Sheets/Default Style Sheet.asset
7. Edit the H1 style to have size of 1em instead of 2em
8. Observe how the changes are shown in the editor straight away. This is expected
9. Undo your changes using Ctrl + Z

Actual results: The value of size is changed back to 2em, however this is not shown in the editor until it refreshes (e.g. by entering playmode).

Expected results: The value of size is changed back to 2em and the change is shown in the editor straight away.

Reproducible with versions: 7000.0.0a11, 6000.1.0a6, 6000.0.30f1, 2022.3.53f1, 2021.3.45f1

Not reproducible with versions: - 

Can’t test with versions: - 

Tested on (OS): Windows 11

Notes: -