Regression: Scripts are being edited as .NET Framework, not .NET Core

[dsyme]

In latest public preview and latest main, when opening and editing a script .NET Framework references are being used, not .NET Core references

Script:

#r "nuget: FSharp.Data, 3.3.3"

With 17.3.3:

With 17.4.0 Preview 2.1 and latest main:

Settings:

[dsyme]

Separately, in the options the inclusion of "Use .NET Core Scripting" under "FSI Preview" is wrong - it is now the default so is unrelated to being preview

[dsyme]

@KevinRansom Regression is here: dc269a9#r85153150

Fix is below

[T-Gro]

(likely have been fixed? @KevinRansom )