This is a known issue regarding how the UI displays pre-check results for this specific component.
VCF Log Management 9.1 introduces a new architecture, migrating from standalone virtual appliances to a containerized microservices architecture hosted on the VCF Services Runtime. Because of this structural change, the transition from 9.0 to 9.1 is an automated side-by-side deployment followed by a configuration migration, rather than a traditional patch.
Due to this workflow, the system performs all necessary health and environment validations in-line during the actual deployment phase. The backend lifecycle service does not support a standalone precheck action for this legacy upgrade path. However, the UI incorrectly exposes the "Run Prechecks" button after the deployment parameters are saved. Clicking it triggers an action the backend cannot process, resulting in the 500 INTERNAL_SERVER_ERROR.