Before 1.20 comes out, please make it so signs from 1.19 and below are converted to waxed signs. There are special signs on servers/maps that have right click commands or just were never supposed to be edited in general and it will be troublesome to go in and wax them. Whereas, normal players having to break their old signs once to unwax them if they want to edit them isn't so troublesome.
I would make a feedback, but if 1.20 comes out it will be too late anyway and people will just have to deal with it.