Quick answer: Unity Cinemachine Timeline track cuts ignoring blend settings after Timeline rebuild? Track caches blend curves; rebuild can reset.
Cutscene's camera blend authored at 0.5s; rebuild Timeline; cuts become instant.
Re-author blends
After rebuild, blend curves may need re-setting. Audit.
Or use external blend authoring
Custom Playable that holds blend; survives Timeline rebuild.
Validate after Timeline edit
Play the cutscene; verify blends. The bug is silent until played.
“Timeline rebuilds reset track caches. Blends are vulnerable.”
If you edit Timeline often, the post-edit validation is mandatory. The bug class hides until playback.