routeros vhdx size change starting with 6.43.10

Hello guys.

New to the world of Mikrotik. I am currently running a mikrotik proof of concept on Hyper V and am ready to move it into production to Azure.

I have noticed huge size change of vhdx file starting with version 6.43.10. It now sits around 70Mb instead of previous 140Mb. Just curious what was the big change as release notes don’t give me any clues. I am converting it to vhd to put on Azure.

Thank you for your insights and time!