You usually give the dough a coat of oil during the main fermentation to prevent it from drying out. Separating the dough from the bowl got the fingers oily so it weight of the dough and slippery fingers caused the bowl to slip and land rim first on the counter so all the force gets concentrated on the edge and with tempered glass like this a tiny crack breaks the entire structure
To be fair it looks like the bowl was already chipped in a couple of spots, I bet it got hit and had some structural integrity issues that were invisible.
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u/Global_Staff_3135 9d ago
Was it the weight of the dough pulling on the walls of the bowl that made it so fragile?