Jim Simon wrote:Clip selection isn't relevant here. Fusion will always open on the topmost visible clip under the playhead, so make sure you're parked on that clip before moving to Fusion.
It does seem to be relevant with 17, since if you make changes on the Fusion page to one clip, then right-click on a second clip and choose "Open in Fusion" but don't click on a node or a blank space in the Node Editor, if you click on any node to add it, it will be added to the previous clip. I tried it last night and twice today and it happened each time, regardless of where the Playhead is or if you use "Open in Fusion".
In the pictures below, I first selected the first clip and right-clicked and selected "Open in Fusion". I then added a Text+ node. I then switched back to the Edit Page, selected the second clip, right-clicked and chose "Open in Fusion". I then, without clicking on anything in the Node Editor, clicked on the Background Node from the toolbar and it wasn't added to the second clip, but to the previous clip's Fusion flow.