Extensions: Why updates are not showing up even though it is available?

Some extensions which I am using have updates as per http://extensions.libreoffice.org/. But when I check for updates using Extension Manager, it is showing “No new updates are available.” Currently I have to download it manually to update. Why updates are not showing up in Extension Manager even though it is available?.

Confirmed bug on my installation. AltSearch 1.4 would not identify and update to 1.4.1

I deleted the extension and reinstalled. It might just be an issue with this extension’s metadata in the repository (I have no other extensions installed to check this with).

Build ID: 1:5.2.0~rc4-0ubuntu1~trusty2
CPU Threads: 2; OS Version: Linux 3.16; UI Render: default;
Locale: en-GB (en_GB.UTF-8)