CMS not loosing the filament after initial load to extruder

I have a new issue that I did not had before.

After accidently CMS pushed filament into buffer when the other end PTF tube was on outside spool and I had to take the buffer apart to clean it… the CMS is no longer loosing the filament after initial load to extruder.

It will initialize just fine, going to the motions of pushing filament in and out… than when I want to extrude or print from any of the four slots the filament is loaded into the extruder gears as normal, and the gears start pulling and here the filament get stuck, the CMS is not loosing it, tension build ( you can see it in the PTF ) and I get error about clogged nozzle… which is BS as I can print just fine from side spool.

What exactly the buffer sensor affect could it be damaged and causing this issue ? Or is it higher, issue with CMS directly?

Damaged buffer, L3 got ripped off by rogue filament


… I have ordered replacement, so it should be ok after…