Fully support EF6 and ObjectContext
We recently upgraded a project 5 to EF6 and while linqpad "works" there are a number of issues.
1; When displaying a Query all navigation properties are loaded even if LazyLoadingEnabled is set to false (the "...Reference" properties are displayed)
2; It is impossible to expand a Connection (upper left window)
3; No filtering is performed for properties displayed in the results so the output becomes huge with whole screens of EntityReferences and AssosicationSets (EntityKeys are also displayed)
Most if not all of theses issues should be quite easily fixable by updating any special logic for ObjectContext to include the new namespace names (System.Data.Objects.DataClasses became System.Data.Entity.Core.Objects.DataClasses.and so on)

All recent versions of EF and EF Core have been well-supported in LINQPad 5 and 6 for some time.
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Pat Pattillo commented
I was considering purchase but if this is an indication of the priority given to fixing the low hanging fruit then I'm out and it's not worth paying for.