USD Stage Actor "Reload stage" option only works for USDA files

Steps to Reproduce

  • In a blank Unreal project, enable the USD plugin, restart the engine

USDA file (works as expected)

  • In a level, create a USDStageActor and open the sphere_1.usda file
  • Replace or update the sphere_1.usda file with the contents of sphere_2.usda
  • Reload the stage (File > Reload Stage)
  • The updates can be seen in the editor

USD file (doesn’t work as expected)

  • In a level, create a USDStageActor and open the sphere_1.usd file
  • Replace the sphere_1.usd file with the contents of sphere_2.usd
  • Reload the stage (File > Reload Stage)
  • The updates aren’t shown in the editor. Completely closing and reopening the stage shows the changes