With apologies, I am not very familiar with how to use OpenStreetMap, so I am unable (and in fact probably shouldn't) edit the actual map. But, I will place a comment here.
Basically, the section of trail I've marked here (that runs from Ramona Falls, across Muddy Fork, then back to the trail junction that is just past [east of] Bald Mountain) is currently closed, and has not in recent years been considered part of the PCT. However, I don't know enough about how OSM works to say that it is definitely NOT part of the trail - perhaps it is, and remains so, but with a re-route that is also labeled (correctly) as the PCT. This would be the section that runs along the Sandy River, and then up to that junction near Bald Mountain.
This section IS normally and recently considered part of the Timberline Trail, and is labeled correctly as such, but it is currently closed and re-routed along the route of the PCT, due to extensive timber blowdown that is not expected to be fixed for a number of years.
I'm writing this because on my Gaia GPS app, this section is labeled as PCT, which is incorrect and misleading. They say they get the data from here, and label it as such since it "has a PCT relation set." Glad to help further, just don't know how!