| Thanks guys!
I am still not 100% that a loose belt could cause a tooth to slip, which in turn could damage the distribution system by having a valve hit the piston, but I have a strong feeling it could be that (also based on what rockhopper said).
Right now the people who usually support me will check if the timing marks line up (trying to figure out what could have happened), and also assess the potential additional damage (e.g. piston crown).
Will keep you posted, since I will have a lot of free time available...
Ciao | 
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