I have exactly the same problem. I regularly but non-systemically get the same message. Textures are stored on a network drive //server/project/bla-bla-bla. There are no third-party plugins in the scene. Max 2023.3, Corona 9 hotfix 1, Win10, Ryzen 3950х.
The message appears more often if you take material from an object in the material editor.
Then rendering stops, but the Stop button is not pressed.