If not fully taxable, then the taxable amount should go on line 4b and the box 1 amount on 4a.
BTW: I agree with you - I think the way is is done is dumb - I am just another user like you, and yes, I did take note of the summary screen (that also seems to be mislabeled as 1040 line 16a and 16b on lined 25 and 32d.) The amount on line 25 appears to be ignored.
Whether they will do anything or not, I do not know.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
