Okay - when I see strange things like this, one thing I do is rename the ESRI folder to ESRI_OLD. There are two ESRI folders to rename. One is in your C:\Users\<your_user_profile>\appdata\local and C:\Users\<your_user_profile>\appdata\roaming. Close ArcGIS Pro, rename the folders, restart and load your *.aprx and try the GP tool again. What is the result? Also are you using your SDE (GDB Administrator) for the input database connection parameter?