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Crossposted [here](https://mathematica.stackexchange.com/q/269150/58370).
Here are more ideas: [Automatically generating a dependency graph of an arbitrary Mathematica function?](https://mathematica.stackexchange.com/a/198348/5478)
Thanks for the example. I'll take a look. To confirm, the algorithm for the exact/symbolic case did change in version 12.3. But the intent was not to degrade performance.