Apple has just released iOS and iPadOS 13.2.3. You can update an iPhone or iPad by going to Settings > General > Software Update.
Here are the complete release notes:
iOS 13.2.3 includes bug fixes and improvements for your iPhone. This update:
Fixes an issue where system search and search within Mail, Files, and Notes might not work
Addresses an issue where photos, links, and other attachments might not display in the Messages details view
Fixes an issue that could prevent apps from downloading content in the background
Resolves issues that may prevent Mail from fetching new messages, and fail to include and quote original message content in Exchange accounts
iOS 13.3 is currently in beta testing.