Versions in project.assets.json are different between restore and build

Description

I set Fsharp.Core to version ~> 4.7.0 in paket.dependencies file inside group webapi and referenced that group in paket.references file inside project as below:
paket.dependencies:

source https://www.nuget.org/api/v2
source https://api.nuget.org/v3/index.json
storage: none
nuget Argu 6.0
nuget FSharp.Core 4.3.4
nuget Expecto 8.13.1
nuget YoloDev.Expecto.TestSdk 0.8.0
nuget Microsoft.NET.Test.Sdk 15.7.2
nuget altcover ~> 6
nuget Packaging.Targets 0.1.155

group webapi
  storage: none
  source https://www.nuget.org/api/v2
  source https://api.nuget.org/v3/index.json
  nuget FSharp.Core ~> 4.7.0

// [ FAKE GROUP ]
group Build
    storage: none
    source https://www.nuget.org/api/v2
    source https://api.nuget.org/v3/index.json
    nuget Argu
    nuget Fake.IO.FileSystem 5.19.0
    nuget Fake.Core.Target 5.19.0
    nuget Fake.Core.ReleaseNotes 5.19.0
    nuget FAKE.Core.Environment 5.19.0
    nuget Fake.DotNet.Cli 5.19.0
    nuget FAKE.Core.Process 5.19.0
    nuget Fake.DotNet.AssemblyInfoFile 5.19.0
    nuget Fake.Tools.Git 5.19.0
    nuget Fake.DotNet.Paket 5.19.0
    nuget Fake.Api.GitHub 5.19.0
    nuget Fake.BuildServer.AppVeyor 5.19.0
    nuget Fake.BuildServer.Travis 5.19.0
    nuget Fantomas

group Analyzers
  source https://www.nuget.org/api/v2
  source https://api.nuget.org/v3/index.json
  nuget BinaryDefense.FSharp.Analyzers.Hashing 0.1.0

paket.references:

group webapi
    Fsharp.Core

after running dotnet restore project.assets.json contains fsharp.core version 4.7.0 but next after running dotnet build project.assets.json contains fsharp.core version 4.7.1 - why is this happening despite paket's specifying version 4.7.1 in paket.lock file? Moreover opening solution with this project in visual studio 2019 restores fsharp.core with version 4.7.1 without building solution - why?

Repro steps

Please provide the steps required to reproduce the problem

1. Set example repo from template from https://github.com/TheAngryByrd/MiniScaffold

2. add project webapi inside src folder by running cmd dotnet new webapi -lang f# -n webapi

3. add group webapi to paket.dependencies as:

group webapi
  storage: none
  source https://www.nuget.org/api/v2
  source https://api.nuget.org/v3/index.json
  nuget FSharp.Core ~> 4.7.0

4. add paket.references file inside webapi project as:

group webapi
    Fsharp.Core

5. run dotnet paket install

6. run dotnet restore

7. examine project.assets.json in webapi's project obj folder

8. run dotnet bulid

9. examine project.assets.json in webapi's project obj folder

Expected behavior

project.assets.json should contain fsharp.core version 4.7.1 after dotnet restore and after dotnet build

Actual behavior

project.assets.json contains fsharp.core version 4.7.0 after dotnet restore and 4.7.1 after dotnet build

Start with the reproduced project and compare project.assets.json after dotnet restore and dotnet build. Read the paket.dependencies and paket.references group configuration, then check how Visual Studio 2019 restores the project. Done means the FSharp.Core version is consistent across restore, build, and solution opening, with the behavior covered by a regression test.