Unity Issue Tracker - Several project templates have the 2D physics option Reuse Collision Callbacks disabled but it should be the default of enabled.

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Fixed in 6000.0.65f1

Fixed in 6000.0.X, 6000.3.X, 6000.4.X, 6000.5.X, 6000.5.0a4

Votes

1

Found in

6000.0.0b11

6000.3.0a1

6000.4.0a1

6000.5.0a1

Issue ID

UUM-129517

Regression

No

Several project templates have the 2D physics option Reuse Collision Callbacks disabled but it should be the default of enabled.

Dec 05, 2025

Reported here:

[https://discussions.unity.com/t/reuse-collision-callbacks-in-2d-physics-settings-is-off-by-default-in-unity-6/1611353]

With this setting off, physics callbacks will produce garbage.

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