Also occurs in 9.x.x
Repro steps:
1. Open a shadergraph
2. Create a Texture2D property
3. Drag it onto the graph
4. Create a Sample Texture 2D node and plug in the property
5. Change the property's texture to a valid texture
6. change the property's texture back to none
Expected result: the sample texture 2D's preview is changed to white
Actual result: the sample texture 2D's preview still has the old texture. Disconnecting and reconnecting the property doesn't fix this. The incorrect preview propagates to downstream node previews and, if plugged into base color, the master preview as well (this does not reproduce on 8.2.0, making this bug unique to 9.x.x and 10.x.x) Saving, closing and reopening the shadergraph fixes the problem.