Fermented food jars keep cracking??

[ChickenChick46]

Temperature reached may be the same if they were baked in a 240 degree oven. But the changes in temperature would be faster in a dry oven.

That's very true. My brain doesn't like to work at 5:40 A.M., lol.

 

[The Yardbird Life]

Baking them is your issue. It has changed the temper of the glass. You can't treat canning jars as we would a Pyrex product. Very different properties at work in the heating and cooling process.