fix for ipc regressions - #373

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v2, actions/setup-dotnet@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Possible null reference argument for parameter 'skeleton' in 'AnimationClip.AnimationClip(AnimationFile file, GameSkeleton skeleton)'.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Non-nullable field '_meshNodeList' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Non-nullable field '_mapping' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Possible null reference argument for parameter 'selectionState' in 'void ObjectEditor.GroupItems(ObjectSelectionState selectionState)'.

Non-nullable field '_selectedMeshes' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Cannot convert null literal to non-nullable reference type.

Non-nullable field '_selectedVertex' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Possible null reference return.

The 'get' accessor of property 'Effect_v2.EffectEndTime' should use 'field' because the other accessor is using it.

The 'get' accessor of property 'Effect_v2.EffectStartTime' should use 'field' because the other accessor is using it.

The 'get' accessor of property 'Effect_v1.EffectEndTime' should use 'field' because the other accessor is using it.

The 'get' accessor of property 'Effect_v1.EffectStartTime' should use 'field' because the other accessor is using it.

The 'get' accessor of property 'Effect_v12.EffectEndTime' should use 'field' because the other accessor is using it.

The 'get' accessor of property 'Effect_v12.EffectStartTime' should use 'field' because the other accessor is using it.

The 'get' accessor of property 'Effect_v11.EffectEndTime' should use 'field' because the other accessor is using it.

The 'get' accessor of property 'Effect_v11.EffectStartTime' should use 'field' because the other accessor is using it.

The 'get' accessor of property 'Effect_v7.EffectEndTime' should use 'field' because the other accessor is using it.