Fix stack overflow condition when appending modifiers to resolver chains.

[eiriktsarpalis]

Fix #112735.

[Copilot]

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

Comments suppressed due to low confidence (1)

src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/OptionsTests.cs:1423

• [nitpick] The test verifies that the modifier is invoked for a type not present in JsonContext.Default. It might be beneficial to also include a test case covering the behavior when a type is handled by the original resolver to ensure complete coverage.

options.TypeInfoResolver = options.TypeInfoResolver!.WithAddedModifier(_ => isModifierInvoked = true);