The old method for packaging binaries for Octopus Deploy, Octopack is not supported for the new dotnet toolchain. The new method is using the octo command line tool (https://octopus.com/docs/api-and-integration/octo.exe-command-line). Please consider adding steps for packaging and pushing nuget packages using the octo tool.
Hi Kirill,
Thank you for reporting this. We will add Octo Pack and Push actions in the next few days.
Meanwhile you can call the octo.exe command line directly from a Run DOS Command / Batch File action or use the NuGet Pack and Push actions (note this requires you to define a .nuspec file).