Try to read this next part without understanding it. If you know English you will find it impossible to NOT find meaning in these letters displayed in a row. That’s more like a subconscious processing. If you’re learning to read English then there’s likely an active “thought” appearing in your experience. See a difference?
Sorry if my replies are annoying, I merely find this subject interesting. Feel free to ignore this.
It is not obvious to me why a being couldn’t have an “understanding” without a “thought”. I do not believe it’s possible to verify if a creature has a subjective experience but an “understanding” of the environment could be attributed to how a being performs in an environment (a crow gets foods that was just out of reach inside a tube of water by adding rocks to raise the water level). I have some experience on game-dev programming and limited understanding on consciousness as a personal interest, if that’s helpful.