Using the Append tool on a hosted feature layer with "Optimize performance for feature services" enabled causes ArcGIS Pro to crash

[blau]

I have a hosted feature layer with around 9,000 features in ArcGIS Portal and a feature class in ArcGIS Pro also with around 9,000 features. I want to use the Append tool to append the features from my feature class to my hosted feature layer. However, when I run the tool with "Optimize performance for feature services" enabled, the tool will always crash ArcGIS Pro. When I disable "Optimize performance for feature services", the tool works just fine. I have tried with and without a field map, but the results are the same as above.

Appending without the optimized performance takes forever, so I'm hoping to be able to use optimized performance. Does anyone know what could be causing this issue?

[Robert_LeClair]

What release of ArcGIS Pro are you using?  There is BUG-000176430 - "Appending features from a file geodatabase to a hosted feature layer in ArcGIS Online fails if the 'Preserve Global IDs' checkbox is checked in ArcGIS Pro 3.4.3."  

This issue has been addressed in ArcGIS Pro 3.5. The 'Optimize performance for feature services' parameter for compatible feature services preserves the input Global ID values from file geodatabases when the 'Matching Fields for Update' parameter is set to the GlobalID fields. Refer to https://pro.arcgis.com/en/pro-app/latest/tool-reference/data-management/append.htm#:~:text=The%20Opt... for more information.