'paket add --interactive' does not do interactive adding

Description

(Tested in 4.8, net5.0, net6.0)

Using paket add --interactive doesn't do what it should; instead of adding the specified package interactively, it justs adds the package to the first found project.

add --interactive is my goto command for adding a package to multiple/all projects in a large solution.

Repro steps

mkdir paket-add-repro
cd paket-add-repro

dotnet new sln -n repro
dotnet new console -f net5.0 -n proj1
dotnet new classlib -f net5.0 -n proj2
dotnet sln add proj1
dotnet sln add proj2

dotnet new tool-manifest
dotnet tool install paket
dotnet tool restore

dotnet paket init
dotnet paket add Newtonsoft.Json --interactive
dotnet paket install
dotnet paket find-refs Newtonsoft.Json

Expected behavior

For every found project, Paket asks me if I want to add the specified reference to it.

Actual behavior

Paket adds the package to the first found project. Note that it also does this without the --interactive flag, which is not what the docs say it should do:

By default packages are only added to the solution directory, but not on any of its projects. It's possible to add the package to a specific project

Last bit of console output:

C:\dev\paket-add-repro>dotnet paket add Newtonsoft.Json --interactive
Paket version 6.2.1+c82f25d6c324024cbd231df154a447a117c2546e
Adding package 'Newtonsoft.Json'
Resolving dependency graph...
Created dependency graph (1 packages in total)
Resolved package 'Newtonsoft.Json' to version 13.0.1
Total time taken: 923 milliseconds

C:\dev\paket-add-repro>dotnet paket install
Paket version 6.2.1+c82f25d6c324024cbd231df154a447a117c2546e
Skipping resolver for group Main since it is already up-to-date
Installing into projects:
Created dependency graph (1 packages in total)
Total time taken: 0 milliseconds

C:\dev\paket-add-repro>dotnet paket find-refs Newtonsoft.Json
Paket version 6.2.1+c82f25d6c324024cbd231df154a447a117c2546e
Main Newtonsoft.Json
C:\dev\paket-add-repro\proj1\proj1.csproj

Total time taken: 0 milliseconds

Known workarounds

E.g: Powershell: (Get-ChildItem -Filter *.*sproj -Recurse).FullName | Sort length -Descending | Foreach {.\.paket\paket.exe add System.Diagnostics.DiagnosticSource --project $_}

Reproduce the behavior with the provided dotnet paket init, paket add Newtonsoft.Json --interactive, and paket find-refs commands, then trace the paket add --interactive command entry point. Done means the command prompts for each discovered project and does not silently add the package only to the first project; verify both interactive and non-interactive behavior against the documented expectations.