The disappearance is definitely a known bug. It was not like that in the 1st build of V12 but then the next build I saw come out had other prescription/printing issues similar but worse. The latest build 369 has this as a known issue and not expected to be fixed until the next version is available (reportedly very soon).

I can not remember what support did to get the printer to change and hold for me but he was able to fix this. It may be under the Administrator Options, set prescription format, select script printer set up. Look there and see if is set to the printer you want or the Microsoft