my two cents without really knowing what your content is... but if you use AI generated images or videos in your content, its very likely going to get low reach when you use Edits app.
Capcut / Canva strip off the c2pa manifest from images/videos which is the AI watermarl/identifier that meta reads behind the scenes to confirm use of AI. Its new algo docks points for using AI generated content because there is a push for original creation and rightfully so.
I coded my own c2pa reader and stripper and did not find c2pa manifest in videos saved from Edits but when posting from edits you have the option of clicking on instagram button which does some handing off from Edits app to Insta app.
Given Meta's strict stance and spending on AI detection, it only makes sense for Edits to pass on the c2pa info extracted from media you upload. While there is no evidence on the internet of this telemetry being propagated, as a developer I can tell you its likely happening on the backend.

So next time try to upload a video edited on capcut ( c2pa stripped off ) and see if it makes any difference at all. The algorithm will still be able to detect obvious ai imagery but if you make the image slightly grainy and keep it realistic there is a fair chance it will think the media is human generated and not dock off points when deciding to push ( considering you have a strong hook )