Problem on Sales

i just install a complete version of axelor (using master branch)
I also install all modules and all demo data

When i go on a draft quotation (Internal Number #4) and i try to add a new product on the quotation
( + New -> choose a product -> clic on OK)
the product is not added to the quotation and when i clic on close i have the message
Current changes will be lost. Do you really want to proceed?
This message is normal of course because i made a modification but i don’t save it

Bug ?

Thanks for your help to understand.

Are you getting this issue with all products or any particular product ? .
Which demo data you have installed english or french ? .

now on 5.1 there is no problem