Major
Nice to have
Bugfix
Major
Bugfix
Detail
#23091
The class BeaconSupport casts to FastListElement without checking
For example, if you want to sort leaves in a tree table only within branches, each cell of a branch is packed into a placeholder. Since most cells only make sense for leaves to be filled or with null, null is also packed here. Logic would be "wrong object type - render nothing." The BeaconSupport class can handle null, but not a wrapped null, because it casts to FastListElement without checking if the object is really a FastListElement.
Test
No test.