Extruder stopped detecting filament

Hi all, I was changing filament and my A1 Mini (no AMS) stopped detecting the new one. I tried different filaments and also changed the ptfe tube position in the AMS adapter.

Bowden tube is clean.
Any idea what is going on?

Not familiar with A1 mini tech, but does the extruder use a hall sensor to detect the filament?

I think I was able to solve the problem. Removing the AMS filament hub (or whatever is called) I found a broken filament piece.
Removing that solved the problem, for now.

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