Hi @brad.bylls .
Probably the proxy is not getting enough.
Here is the result of running the following sample with the attached file.
# Fusion360API Python script
import traceback
import adsk.fusion
import adsk.core
def run(context):
ui = adsk.core.UserInterface.cast(None)
try:
app: adsk.fusion.Application = adsk.core.Application.get()
ui = app.userInterface
des: adsk.fusion.Design = app.activeProduct
root: adsk.fusion.Component = des.rootComponent
moldBaseOcc: adsk.fusion.Occurrence = root.occurrences.itemByName('MoldBase:1')
moldBaseComp: adsk.fusion.Component = moldBaseOcc.component
moldBaseSketchName: str = 'Reference Sketch'
resultOcc: adsk.fusion.Occurrence = root.occurrences.itemByName('Result:1')
resultComp: adsk.fusion.Component = resultOcc.component
resultSketchName: str = 'Result Sketch'
resultxyPlane: adsk.fusion.ConstructionPlane = resultComp.xYConstructionPlane
# create sketch
sketches = resultComp.sketches
newSketch = sketches.addWithoutEdges(resultxyPlane)
newSketch.name = resultSketchName
# create proxy
newSketchProxy = newSketch.createForAssemblyContext(resultOcc)
# get reference sketch
moldBaseSketch: adsk.fusion.Sketch = moldBaseComp.sketches.itemByName(moldBaseSketchName)
# create proxy
referenceSketchProxy = moldBaseSketch.createForAssemblyContext(moldBaseOcc)
# execute project
sketchPoints = referenceSketchProxy.sketchPoints
[newSketchProxy.project(p) for p in sketchPoints]
except:
if ui:
ui.messageBox('Failed:\n{}'.format(traceback.format_exc()))

For more information about proxies, please click here.
https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-88A4DB43-CFDD-4CFF-B124-7EE67915A07A