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