Aseprite Script crashes when attempting to copy-paste between files

[Ev-Abbott]

Hello! I have an animated tile map I am trying to automate by copying the frames from a tile merged cell by cell into a new file. Selection and new frames work all well but when I attempt to paste my selection, the application crashes.

Script in Question:

do
  local spr = app.activeSprite
  if not spr then return app.alert "No Active Sprite" end

  local basePath = "PathFromRoot/To/Tiles/Directory"
  
  app.transaction(
    function()
      local current = app.open(basePath .. "/WaterTiles.aseprite")
      local standardLayer = app.activeLayer
      local newSprite = Sprite{ fromFile=basePath .. "/Test.aseprite" }
      local newSpriteLayer = newSprite.layers[1]
     
      for i = 1,8 do
        local frame = newSprite:newEmptyFrame()
        app.activeSprite = current
        app.activeLayer = standardLayer
        app.activeFrame = i
        current.selection:select(Rectangle(0, 0, 16, 16))
        app.command.CopyMerged()
        app.activeSprite = newSprite
        app.activeLayer = newSpriteLayer
        app.command.Paste()
        current.selection:deselect()
      end
    end
  )
end

OS:
macOS BigSur 11.1

Any help would be appreciated!