Greyed-out Texture2D field in inspector?

Shader Graph 7.7.1. After adding a new Texture2D Parameter to a subgraph, I’m now seeing this on all material inspectors that use this subgraph:

7446704--913178--upload_2021-8-25_1-13-21.png

Unity’s adding this to every material upon looking at the material in the inspector:

    - _SimpleLitSampler_79D1133D_Texture2DD2CC6C52_1931811911:
        m_Texture: {fileID: 0}
        m_Scale: {x: 1, y: 1}
        m_Offset: {x: 0, y: 0}

If I edit the subgraph file in a text editor, I find that this is indeed the new Texture2D property just added. However, this property isn’t any different than the other few Texture2D parameters I already had in the subgraph, none of which create these inactive entries in the inspector.

7446704--913181--upload_2021-8-25_1-16-54.png

Any idea what’s causing this? I’ve tried deleting the Texture2D parameter and adding it again, but that just adds yet another entry to the material.

Having the same issue in 2020.3.34f1! Did you ever figure it out?