"Assertion failed: CellIndex < CellIndexMax" when there are a lot of HISM foliage in a level

Users have come across an issue in 5.4 that causes an assert when many foliage or HISM objects are placed in a level due to a cell size limit.

1. Create a new actor class using the code provided by the comment in the case.
2. Create a blueprint from the class.
3. Add the blueprint to a blank level.
4. Run the game and it should trigger the assert.

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