Retired parts stay out of the reminder picker
Setting a reminder offered every part the bike had ever carried, retired ones included. Since a retired part is not something you can service, it no longer appears in the list. Editing a reminder that was already set on a retired part still shows that part, so nothing you open reads as blank.
A bike you can recognise
Choosing a bike for an activity showed the model, with an internal reference underneath it. It now leads with the name you gave the bike and follows with the make and model beneath — the same way the bike switcher reads. Bikes you have not named still lead with the model, without repeating it twice.
The same fix applies to the bike list in the activity filters.