Cinematic cancels as it starts
Zero-displacement cursor callbacks and tiny rotation reproduced cancellation. The filter passed a development test on Fabric 1.21.10. Individual reports still need a confirmed cause.

OPEN INVESTIGATION
Similar symptoms can have different causes. Here we show evidence without calling unconfirmed reports solved.
Zero-displacement cursor callbacks and tiny rotation reproduced cancellation. The filter passed a development test on Fabric 1.21.10. Individual reports still need a confirmed cause.
Duplicate keys and accidental Ctrl+H have confirmed cases. New defaults and the resolver are in development; saved bindings are preserved.
The session now resets by world identity. Development reentry passed on Fabric 1.21.10 and NeoForge 26.1.2; the full matrix and modified clients are pending.
No reproduction has established a common cause yet. Render pipeline and compatibility auditing continues.
Filters show investigation scope; they do not establish that every version is affected.