If I read the repair description correctly, you had mixed the powder and glue together and then stuffed a little blob into the slot?
If this is the case, this would have created a matrix of baking soda and glue that is kind of like hard packed snow which indeed would not be structurally stable under load.
Settling the powder in the slot and dripping the adhesive in there forms a matrix that is more like a very hard ice ball, one that has been saturated in water and placed in the deep freeze.
Although our parents would surely ground us for finding such nefarious contraband hidden in the Fridgidaire :-D