Hi,
I've this model builder :

It works if I run it from the builder window but if I run it as a tool, I always get an error saying that the feature class from the merge tool already exists and that there can't be 2 fc with the same name.

However, my ArcGIS Pro options are set to overwrite AND if I try the merge tool alone (with the same output name), it works.
What's the problem?
Thanks!