Reproduction steps:
1. Open the attached project "ReproProj"
2. Open the “/Assets/Scenes/SampleScene.unity” Scene
3. In Hierarchy select the “IK“ GameObject
4. In Inspector, find “IK Manager 2d (Script)” Component
5. Remove the non-assigned(second) Solver

Expected result: No Errors exist
Actual result: Error “IKGizmos: Mismatching number of solvers“ is present

Reproducible with: 13.0.2 (6000.3.3f1), 14.0.2 (6000.4.0b3, 6000.5.0a4)
Could not test with: 10.2.2 (6000.0.65f1) (Library\PackageCache\com.unity.2d.common@51e9484895c4\Editor\ScriptablePacker\SpriteAtlasGeometryPacker.cs(876,33): error CS0115: 'SpriteAtlasGeometryPacker.Fit(SpriteAtlasPackingSettings, SpriteAtlasTextureSettings, ScriptablePacker.PackerData)': no suitable method found to override)

Testing environment: Windows 10 Enterprise 21H2
Not reproducible on: No other environment tested

Note:
- The only way to stop the Error spam is to Undo the operation or disable/remove the Component