The SwitchOnRebuild index feature requires two physical search indexes per each logical search index. Azure Search provider might resolve a wrong physical index resulting in empty or outdated search results.
To resolve the issue, consider one of the following options:
Be aware that the hotfixes were built for specific Sitecore XP versions, and must not be installed on other Sitecore XP versions or in combination with other hotfixes. In case any other hotfixes have already been installed on a certain Sitecore XP instance, send a request for a compatibility check to Sitecore Support.
Note that the ZIP file contents must be extracted to locate installation instructions and related files inside. The hotfixes must be installed on a CM instance and then synced with other instances using standard development practices.