---
applies_to:
- client
- server
- aws-sdk-rust
authors:
- ysaito1001
references:
- smithy-rs#4117
breaking: false
new_feature: false
bug_fix: true
---
Fix a bug where fields that were initially annotated with the `required` trait and later updated to use the `addedDefault` trait were not serialized when their values matched the default, even when the values were explicitly set. With this fix, fields with `addedDefault` are now always serialized.
