Doughs combining in oven

We prepared two doughs, each one isn’t large enough to require the separation of the challah. Then we put them in the oven together to bake. Do they join so as to require the separation of the challah?

Dear …!
The oven does not join the dough together. If you want to become obligated to separate the challah, you can put them in a large utensil after baking or wrap them together in a towel or a bedsheet or something similar.

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