Obi Scripts Backends Burst issues

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I have Burst 1.8.4  and Obi Rope 6.5.1 in a new project in 2022.2.12
With this, my console has the following 3 errors:

• Assets\Obi\Scripts\Common\Backends\Burst\Solver\DequeueIntoArrayJob.cs(12,31): error CS8377: The type 'T' must be a non-nullable value type, along with all fields at any level of nesting, in order to use it as parameter 'T' in the generic type or method 'NativeQueue<T>'
  
• Assets\Obi\Scripts\Common\Backends\Burst\DataStructures\NativeMultilevelGrid.cs(34,13): error CS0305: Using the generic type 'UnsafeList<T>' requires 1 type arguments
  
• Assets\Obi\Scripts\Common\Backends\Burst\DataStructures\NativeMultilevelGrid.cs(88,36): error CS8377: The type 'NativeMultilevelGrid<T>.Cell<T>' must be a non-nullable value type, along with all fields at any level of nesting, in order to use it as parameter 'T' in the generic type or method 'NativeList<T>'
  

I found a thread where it was suggested that Burst 1.8.3 works, however this did not resolve it for me.
Additionally, I have tried looking for something in FAQ incase I missed a step or dependency version but it seems this is a niche or new bug.

Looking for a way to proceed, thanks.