...the drop-down ("HM" immunization) menus never save the immunization.
This seems to be working now, since the version 5.024 update.
... the "non-HM" injections don't seem to build up a default list as immunizations are entered. For instance, prior injections of B12 don't seem to persist in this listing, so that future immunizations can be entered without a lot of typing.
Unfortunately, this still is not working. More "standard" immunizations should be added to the drop-down "HM" menu, until the AC team can get the "non-HM" menu to start saving manually entered "custom" immunizations.