I haven't heard of this, but I'd have to test to specifically look for it to say for sure, which I'll look to do maybe today.
Myself, I usually recommend a separate install of GP at the new version, just in case something happens, you have the original to go back to. Plus, when updating dictionary files, greater chance something gets corrupted, compared to a new install at the updated version. This is just my opinion, no evidence it is better than the other option.
Same as with modified forms and reports, always have a package file containing them, on top of backups of the dictionary files.
We'll update as soon as we find something more.
Thanks