today I tried to open some indesign package (done on my Imac) on my old mac mini.
When I open every single indesign file, it don't read the "document fonts" folder, and even if it recognize the links contained in "links" folder, it show them in very low resolution, as if they were missing; but
when I try to relink one them (to the same folder) then every link and every font in the document it were shown well. I tried with cc2019 and cc2020 with same results.
Yeah I would try to do a Save As, the drop back in all the links freshly into Indesign, which can be a pain if there are a lot of linked files, then change the font to something else then back, then Re-package.