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Errors on "cannot be imported again. It was already imported This is most likely a build authoring error. This subsequent import will be ignored"

See original GitHub issue

Issue Description

I receive many error on messages as :

Error: "/home/xarkam/.vscode/extensions/ms-dotnettools.csharp-1.23.0/.omnisharp/1.36.1/omnisharp/.msbuild/Current/Bin/Microsoft.WorkflowBuildExtensions.targets" cannot be imported again. It was already imported at "/home/xarkam/.vscode/extensions/ms-dotnettools.csharp-1.23.0/.omnisharp/1.36.1/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets (6160,3)". This is most likely a build authoring error. This subsequent import will be ignored. [/home/xarkam/Developpement/Base/src/SoftinuxBase.Infrastructure/SoftinuxBase.Infrastructure.csproj]

Steps to Reproduce

I don’t know how to reproduce it maybe it is something with my project or the latest omnisharp update

Expected Behavior

Fix the errors

Actual Behavior

I am notified of errors in omnisharp

Logs

OmniSharp log

onmisharp.log

C# log

Post the output from Output-->C# here

Environment information

VSCode version: 1.48.0 C# Extension: 1.23.0

Mono Information

OmniSharp using built-in mono

Dotnet Information

.NET Core SDK (reflecting any global.json): Version: 3.1.401 Commit: 39d17847db

Runtime Environment: OS Name: neon OS Version: 20.04 OS Platform: Linux RID: linux-x64 Base Path: /usr/share/dotnet/sdk/3.1.401/

Host (useful for support): Version: 3.1.7 Commit: fcfdef8d6b

.NET Core SDKs installed: 3.1.401 [/usr/share/dotnet/sdk]

.NET Core runtimes installed: Microsoft.AspNetCore.App 3.1.7 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App] Microsoft.NETCore.App 3.1.7 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET Core runtimes or SDKs: https://aka.ms/dotnet-download

Visual Studio Code Extensions

Extension	Author	Version
better-comments	aaron-bond	2.1.0
Bookmarks	alefragnani	11.3.1
bracket-pair-colorizer-2	CoenraadS	0.2.0
csharp	ms-dotnettools	1.23.0
csharpextensions	jchannon	1.3.1
dart-code	Dart-Code	3.13.2
debugger-for-chrome	msjsdiag	4.12.9
discord-vscode	icrawl	4.0.0
docomment	k–kato	0.1.18
dotnet-test-explorer	formulahendry	0.7.4
emojisense	bierner	0.7.0
errorlens	usernamehw	3.2.0
flutter	Dart-Code	3.13.2
gistfs	vsls-contrib	0.1.8
git-graph	mhutchie	1.25.0
githistory	donjayamanne	0.6.9
gitignore	codezombiech	0.6.0
gitlens	eamodio	10.2.2
html-css-class-completion	Zignd	1.19.0
html-snippets	abusaidm	0.2.1
html5-boilerplate	sidthesloth	1.0.3
LogFileHighlighter	emilast	2.9.0
output-colorizer	IBM	0.1.2
path-intellisense	christian-kohler	2.2.1
polacode-with-copy	fy	0.3.4
prettier-vscode	esbenp	5.1.3
python	ms-python	2020.8.101144
quicktype	quicktype	12.0.46
remote-wsl	ms-vscode-remote	0.44.4
rest-client	humao	0.24.1
trailing-spaces	shardulm94	0.3.1
vetur	octref	0.26.1
vscode-coverage-gutters	ryanluker	2.6.0
vscode-eslint	dbaeumer	2.1.8
vscode-firefox-debug	firefox-devtools	2.9.0
vscode-html-css	ecmel	0.2.3
vscode-icons	vscode-icons-team	10.2.0
vscode-nuget-gallery	patcx	0.0.22
vscode-nuget-package-manager	jmrog	1.1.6
vscode-solution-explorer	fernandoescolar	0.3.10
vscode-typescript-tslint-plugin	ms-vscode	1.2.3
vscode-versionlens	Hoffs	0.25.6
vscode-versionlens	pflannery	1.0.8
vscodeintellicode	VisualStudioExptTeam	1.2.10
vsliveshare	ms-vsliveshare	1.0.2619