Fix for uum-131151

[arnaudparevogt-unity]

Purpose of this PR

Fixed UUM-131151 (public issue)

Testing status

Tested the 3d samples + added an automated test

• Added an automated test
• Passed all automated tests
• Manually tested

Documentation status

No doc needed, this is a bugfix

• Updated CHANGELOG
• Updated README (if applicable)
• Commented all public classes, properties, and methods
• Updated user documentation

Technical risk

Tech risk: low, halo effect: low

Comments to reviewers

Package version

[Justification for updating either the patch, minor, or major version according to the semantic versioning rules]

• Updated package version

[u-pr]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

🎫 Ticket compliance analysis ✅ UUM-131151 - Fully compliant Compliant requirements: Fix the issue where the camera blend snaps to a cached position when switching back before a blend completes Ensure that the camera blends smoothly from the current camera position instead of the old cached one

⏱️ Estimated effort to review: 1 🔵⚪⚪⚪⚪ The PR provides a minimal, well-isolated bug fix that clears the snapshot state appropriately and includes a highly effective unit test that directly verifies the reported edge case.

🏅 Score: 100 The implementation directly and cleanly addresses the reported bug, handles state reset properly, and includes excellent automated test coverage to prevent future regressions.

🧪 PR contains tests

🔒 No security concerns identified

⚡ No major issues detected

Update review

---

🤖 Helpful? Please react with 👍/👎 | Questions❓Please reach out in Slack #ask-u-pr

[u-pr]

PR Code Suggestions ✨

No code suggestions found for the PR.

[glabute]

Nice catch! And good fix.
I made a small comment, which is a suggestion for clarity.

[glabute]

Should call ClearSnapshot() here, for clarity

[codecov-github-com]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...unity.cinemachine/Runtime/Core/CameraBlendStack.cs	88.88%	1 Missing ⚠️

@@            Coverage Diff             @@
##             main    #1106      +/-   ##
==========================================
+ Coverage   17.07%   17.14%   +0.06%     
==========================================
  Files         209      209              
  Lines       23759    23768       +9     
==========================================
+ Hits         4058     4074      +16     
+ Misses      19701    19694       -7     

Flag	Coverage Δ
cinemachine_MacOS_2022.3	?
cinemachine_MacOS_6000.0	?
cinemachine_MacOS_6000.3	?
cinemachine_MacOS_6000.4	?
cinemachine_MacOS_6000.5	?
cinemachine_MacOS_6000.6	?
cinemachine_Ubuntu_2022.3	?
cinemachine_Ubuntu_6000.0	?
cinemachine_Ubuntu_6000.3	?
cinemachine_Ubuntu_6000.4	?
cinemachine_Ubuntu_6000.5	?
cinemachine_Ubuntu_6000.6	?
cinemachine_Windows_2022.3	17.17% <88.88%> (+0.06%)	⬆️
cinemachine_Windows_6000.0	17.07% <88.88%> (+0.06%)	⬆️
cinemachine_Windows_6000.3	17.07% <88.88%> (+0.06%)	⬆️
cinemachine_Windows_6000.4	17.07% <88.88%> (+0.06%)	⬆️
cinemachine_Windows_6000.5	17.07% <88.88%> (+0.06%)	⬆️
cinemachine_Windows_6000.6	17.07% <88.88%> (+0.06%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...unity.cinemachine/Runtime/Core/CameraBlendStack.cs	63.05% <88.88%> (+3.88%)	⬆️

... and 1 file with indirect coverage changes

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