Edit Brew not saving when Bottle Date is populated

The Edit Brew feature is not saving the data modified anywhere in the form if Bottle Date contains a value.

Reproduce by:

1. Brew a recipe, then editing the brew.
2. Update any field other than bottle date, save, and verify the field is updated.
3. Update the bottle date, save, and verify the field is not updated.
4. Update the bottle date and any other field, and verify neither have been updated.

Start by reproducing the issue through the Edit Brew form using the four steps in the report, focusing on the Bottle Date field and the save path. Trace the form entry point and the handling of the submitted brew data. Done means changing Bottle Date alone, or Bottle Date with another field, saves all modified values.

Written by the indexing model from the issue text.