Not able to reset TMP Font Asset Atlas Material after pressing “Reset” in Unity 6

Hello,

I am using Unity 6 (6000.0.25f1)

I am trying to reset Atlas Material as seen in the video (Timestamp after 7:11) Video by Zolran, “TextMeshPro - Dynamic Font Asset Creation Process” https://youtu.be/NY1xKqCIj3c?si=t-yvjBfZ01JkJL1r&t=430.

Pressing “Reset” in both xxx SDF (TMP_Font Asset) and xxx Atlas Material (Material), see image, does not reset Atlas Material back to empty. It flashed one time and nothing seems to happen. Those text still display as normal where it should be displaying missing font using square icon.

Have you guys encounter this?