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When a client (correctly) calls the `DELETE` endpoint to remove a custom profile field (like Element X does with `m.status`), we incorrectly don't include it in the sync response in legacy sync. This was due to the fact that we cleaned up the sent fields down to what fields the profile currently has. Always ensure any fields in `ProfileUpdateAction.UPDATE` are sent down, as `null` values for profile fields which have been deleted. Fixes an issue where clearing a user status from Element X does not reflect in the user status being cleared on Element Web. Note, target is the v1.160.0 release branch due to customer commitments, and this fixes web and mobile clients not working together correctly. ### Pull Request Checklist <!-- Please read https://element-hq.github.io/synapse/latest/development/contributing_guide.html before submitting your pull request --> * [ ] Pull request is based on the develop branch * [x] Pull request includes a [changelog file](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#changelog). The entry should: - Be a short description of your change which makes sense to users. "Fixed a bug that prevented receiving messages from other servers." instead of "Moved X method from `EventStore` to `EventWorkerStore`.". - Use markdown where necessary, mostly for `code blocks`. - End with either a period (.) or an exclamation mark (!). - Start with a capital letter. - Feel free to credit yourself, by adding a sentence "Contributed by @github_username." or "Contributed by [Your Name]." to the end of the entry. * [x] [Code style](https://element-hq.github.io/synapse/latest/code_style.html) is correct (run the [linters](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#run-the-linters))