There are only 999 possible version numbers available for sideloading - Broken DoSvc

Due to the issues described in

https://techcommunity.microsoft.com/t5/msix-deployment/windows-10-2004-msix-not-updating-please-check-whether-the/m-p/1466701

see also

https://stackoverflow.com/questions/64381453/appinstaller-xml-issue/67390614#67390614

It is not viable to distribute msix packages with sideloading if any field of the version number is more than a single digit. And the final field is never used and not recognised as newer when changed. This leaves the viable number of versions at 999, ranging from 0.0.0.0 to 9.9.9.0

This is not enough for any normal agile development process and will result in a situation where you suddenly have to rebuild your entire deployment system.

I advise that no one uses sideloading msix deployment until microsoft fixes this issue by patching the Delivery Optimization Service in Windows.