forum thread https://forum.babylonjs.com/t/babylonreactnative-throws-exception-when-adding-anchor/50716/13

addAnchorPointUsingHitTestResultAsync kicks an exception.

call stack with a bunch of printf:

Frame is destroyed before being used for adding an anchor.

This is not an issue until the allocator returns the same allocated pointer. When the pointer is different (an allocation occured in the meantime), then the pointer is invalid. memory is cleared to zero after deallocation.

Investigations:

• drawFrame happens in dtor for frame. Keeping a smartpointer will make rendering stutter for a few frames.
• is it possible to attach System::Session::Frame to an object and not destroy/create every frame?
• This is 1 instance of the unsafe pointer :

  BabylonNative/Plugins/NativeXr/Source/NativeXr.cpp

  Line 1737 in 59798a7

  XRFrame* m_frame{};

  there and other pointers for XRPlane as well.