Based on the Bambu Lab Over-Engineered Y-Splitter version 2, I modified the filament entry side for a smooth filament entry and do not catch up due to the gap between the PTFE tube and the entry.
In the picture, on left is the original and right is the mod.
You will need to download the locking clip here
https://www.printables.com/model/298958-bambu-lab-over-engineered-y-splitter
Use release rings: QTY: 3 of PC4-UM2 from Amazon.