Rumor is that it was the forward strut, lower pin "came loose" and no longer carried load, Remaining two not sufficient to carry loads, everything else ripped apart.
Q: same struts for 225 as previous versions?
As we earlier noted, this model is considered new, but the certification basis is clearly associated with previous models. Fatigue evaluation of structure is from amendment 20, 1980, which is not the same as today. New versions require threat assessment, which may have better predicted (and thus mitigated) issues with the struts and their attachment.
Even to the old standards, questions should be asked to ensure that the new aircraft and new loads are used to show that same or similar parts are safe.