The 3.5l ecoboost for the Raptor is not the exact same engine as the 3.5l ecoboost found on the F-150 (non-Raptor). The 3.5l is tweaked or changed (probably slightly) based on the application (e.g. it's HP ranges from 320 to 380 depending on the platform it will be used on). Of course I believe the main comonents are going to be the same but the things that do change may be problematic for the new application.
Also, the 3.5l ecoboost was redesigned in 2015 (known as gen 2) and first used in production in 2017. So gen 1 3.5l ecoboosts cannot be fairly compared to gen 2 3.5l ecoboosts.
It seems as though the 2nd gen 3.5l ecoboost is being used with the 2nd gen Raptor, so there could indeed be some growing pains even though the Raptor and gen 1 3.5l ecoboosts have been out for ~10 years.
I've read about 2017s and 2018s (and prior gen 1 ecoboosts) with the cam phaser issue but can't find any cam pahser issue data on 2019s so the issue may have been fixed for 2019, going forward.
If anyone has a 2019 (with specific details about it having the issue) please chime in!
Hopefully!!