Foliage meshes do not appear in high res screenshots after certain amount

When using the Engine's High Res Screenshot tool, there is a limit on the amount of foliage that can be present before the meshes stop appearing. This number is around 1500 meshes, though I was not able to get an exact number. This issue appears to be a regression, as this does not occur in engine version 4.16

Versions Tested:
4.16.3 - CL: 3561208 - Issue does not occur
4.17.1 - CL: 3586342 - Issue occurs
4.18 - CL: 3597901 - Issue occurs

1. Create a new project with Starter content included (No template needed)
2. Create a new level of type default
3. In the new default level set the scale of the floor mesh to 10 on all axis
4. In the Foliage tool add the mesh SM_Bush into the foliage type
5. Using the foliage brush paint the whole floor mesh in the level (Cover it as much as possible)
6. Using the console type in HighResShot 2 and open the file that appears in the alert box
   Result: No foliage will be displayed in the screenshot
   Expected Result: Foliage would be displayed in the screenshot

[UE-23848] Bug Status

Fix UE-51650

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