Imposter renders incorrectly in PCG volume after updating to 5.4

The last level of impostors in PCG volumes render incorrectly after updating from 5.3 to 5.4.

1. Download the sample project in the additional info URL
2. Open the Test_Map level
3. Force the last level LOD to render by setting using r.ForceLOD 3 or set Force Lod Model to 4 by select the ISM_SM_Tree_Birtch_A_01_bcg_6 element in the PCG_TBOP_DistantTerrain_debug PCGVolume OR use 

Expected

The imposter renders like the instanced foliage actor imposter next to it

Actual

The imposter renders vertically and very small.
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