1. In case of using "Copy to" script:
When an interactive render is using, merging new objects cause a Max Application error. It still asking to save a copy of current scene but "OK" button is not working, Max gives no answer. Just a closing cross in error window is flickering.
2. In case of merging objects from max. files:
When an interactive render is using, merging new objects with "File-Import-Merge":
a. Max will just stop responding;
b. The interactive render will stop. Trying to start it again an error window will show up.
3D max 2019, Corona render 5(hotfix 2)