Debugging and hitting a black box?
It happens often with frameworks: you follow the code, everything is fine, then suddenly... vendor/. No more visibility, you have to guess what happens inside, and it can be frustrating when you are learning.
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Have you ever read your framework's code?
Not the documentation. The code. The one that actually runs in your project.
If you use a "classic" framework, that code is hidden somewhere in vendor/. Abstract, distant, untouchable. When a new version ships with a breaking change, you deal with it. When a behavior does not suit you, you work around it. When you want to understand what is really going on, good luck.