When I upgraded from 21.05.03 to 21.11.03 I found when adding an item using the book framework it would refuse to save the net item. It instead displayed a popup that stated a mandatory field was blank. It does not provide any visual indication as to which field is the problem. (I have 6 visible mandatory fields)

I determined that the specific field that was causing the problem had the dateaccessioned.pl plugin and is the 952$d. The date picker does generate a date which looks normal, but the item just can’t be saved.
 
When I edited the framework to make this field not mandatory, then I can save newly created or edited items. The date in the picker is shown correctly in the display of the saved item.

In 21.05.03 there was no problem. I read bug 29369 and examined the code and this had been applied in 21.11.03.
The workaround is totally acceptable to me and works fine with no other issue noticed so far.