You are sharp! The programmers choose how data is entered based on all the moving parts. The programmers work year round as this is a massive program.
@KrisD15 is right about changes this year and the ROTH conversion. The programmers had to be ready for anything. It is better to have the program ready and fill a space without need than to be frantically trying to create something.
As you said, it has no effect on your return so all is well. Turbo Tax is working year round to make sure your return is accurate.
Just for kicks:
IRS retirement plans
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