Summary

Hello,
When using the AdoptExternalGuides node to drive a dense groom with sparse simulated proxy guides (Master Guides workflow), the Use Control Guide's Strand Groups option does not work as expected. The hairs are still being influenced by control guides belonging to other strand groups.

With Use Control Guide's Strand Groups enabled, hairs belonging to a specific Strand Group ID should strictly follow the control guide that shares the exact same Strand Group ID. It should completely ignore control guides from other groups, regardless of their physical proximity.

Hairs are snapping to or being deformed by control guides from adjacent/different strand groups. It seems the node ignores the strict group matching and falls back to distance-based influence, causing the grouped strands to tear apart and attach to neighboring proxy guides.

I have verified that Strand Groups are correctly generated and match perfectly across the base groom, Control Guides, and Reference Guides.
Please check the attached video and Maya scene for the exact setup and reproduction of the issue.