Validate wrong results?

[SyntaxTalksToMe]

Good day,

If I want to validate a JSON using a schema, I get an incorrect result.

Case 1:
I used the directed SPDX schema. (https://github.com/spdx/spdx-spec/blob/development/v2.3.1/schemas/spdx-schema.json)
I then took an SPDX Json file and deliberately destroyed the structure by deleting elements.
As a result, I received a 0 error count during validation.
However, if I only insert minor errors and do not make major changes to the structure, the validation works.

Case 2:
I had also tested a json that did not match the schema at all. There I also got 0 error counts.

Case 3:
If I try the example from https://medium.com/@niteshsinghal85/validating-json-with-schema-in-net-7bdc02b0ef3c the Validation works as expected.

Basically, I would have expected that no matter which json I wanted to validate using a schema, this would also work and at least get some feedback that something is not taking.
So I wanted to ask if this behavior is correct, or if I have misunderstood something or made a mistake in my thinking about how this validation works.

Thanks and good times