Describe the bug
`call_validation_error_handler_default': Return value: Expected type T.any(Integer, Symbol), got type NilClass (TypeError)

To Reproduce
Steps to reproduce the behavior:

1. https://github.com/riscv-software-src/riscv-unified-db/actions/runs/18366574864/job/52320461412?pr=1165#step:6:1042

Text output/Error Messages
`call_validation_error_handler_default': Return value: Expected type T.any(Integer, Symbol), got type NilClass (TypeError)

Additional context
With this issue, I'm not able to diagnose the error message and can't conclude if the IDL has an issue.