As the title suggests, the deduplication process works sometimes, but mostly not. I noticed a strange behavior on my Facebook test environment. Even though I managed to create and pass same event ids for sGTM and pixel the output is not how it’s supposed to be.
To be exact the events coming from Server and Web are not grouped even though they have the same ids
You can see more details on my screenshots bellow:
this is the only time that worked: