"Bottled on" being set does not save any data when updating Recent Brews

When updating a Recent Brew with bottling data, I noticed that none of the changes I'd made when updating the Brew were saved. After re-trying it a number of times, I isolated it to the app not saving when Bottled On was filled out. I can reproduce this via:
- Add a brew, fill out OG and date
- Update brew, filling out FG and Bottled On with a date
- No updates will be saved to the brew

Reproduce the issue by adding a brew with OG and a date, then updating it with FG and a Bottled On date. Trace the Recent Brews update path and verify that all entered changes are persisted when Bottled On is filled out.

Written by the indexing model from the issue text.