by doing tests with block commands, I moved the maximum temperature that an oven can cook and my creation got a display bug,
I tell you that this is not a huge bug that does not need to be fixed quickly because it is very difficult to provoke but I mention it so that it will be fixed one day
by the way I suggest to ensure that if the value is equal to or greater than the maximum temp it must force the object to be cooked in the oven

Step 1: place Furnace
Step 2: modify the data with this command for example "/data merge block ~ ~ ~

"
Step 3: measure the objects to be cooked