Upgraded A* in my project to 5.4 and I get these errors when trying to build:
Assets\External\AstarPathfindingProject\Core\Collections\Span.cs(389,49): error CS0117: 'NativeArrayUnsafeUtility' does not contain a definition for 'GetAtomicSafetyHandle'
Assets\External\AstarPathfindingProject\Core\Collections\Span.cs(391,5): error CS0103: The name 'AtomicSafetyHandle' does not exist in the current context
Using Astar 5.4.0, Unity 6 (6000.1.0f1), Windows, HDRP.