[BUG] semiauto schema derivation looses generic type

[lgmyrek]

Tapir version: 1.10.12

Scala version: 2.13.14

Describe the bug
semi-auto derived schemas loose generic type, it fallbacks to placeholder eg. A which causes schema mixup.

How to reproduce?
context: https://softwaremill.community/t/why-subtypenametoschemaname-in-schema-derivation-always-recalculates-snames/409/5

Additional information

[adamw]

This might be quite challenging to fix, as I think Magnolia derives the schema for AdtTree[A], without knowing the specific parameter names. The schema is then reused. Maybe if we implement a custom schema derivation macro, we'd be able to resolve this 🤔