Hi
So I tested a setup with two PTFE tubes connected with an original Connector from bambu and the tubes are 45cm and 55cm long. So together approx. 1 meter PTFE tube and I have so far no issues. I only printed PLA with it and only with the AMS lite.
I have since my last comment also gotten my hands on a TPU filament (not compatible with the AMS lite) and there I see similar results as the print in your picture. The problem is most likely caused by too much friction. When I put the TPU spool on the external spool holder the printer need to pull on the filament and therefore pull strong enough to turn the spool itself. But the spool holder is not turning itself so you drag the spool rather than turning and for a soft filament like TPU this seems to be too much friction. When I unspool somewhat of the filament and just lay it down the need of turning the spool by the printer is gone and all my prints worked this way (but it is super annoying as you have to unspool the filament again ang again during your print).
I tell you this as you might have a setup that somewhere causes too much friction since you changed your tubing.
Otherwise you could have a clogging problem in the extruder.
Did you find a workaround in the meantime?