Linq Expression translation is off

This is primarily seen in libraries like EF core that take the C# translation as canonical (and often don't recognize F# translations). However this case warrants a bit of extra investigation in my opinion, it's a very verbose translation that probably doesn't need to be like this.

https://github.com/dotnet/efcore/issues/14013

Translation error:

> The LINQ expression 'where (copyOfStruct => (copyOfStruct != null).Invoke([x].creationDate) AndAlso (copyOfStruct => Convert(copyOfStruct, DateTimeOffset).Invoke([x].creationDate) < 30/11/2018 11:01:57 +00:00))' could not be translated and will be evaluated locally.

Original expression:
```fs
// the lambda here is the expression pointed to in the error
context.Blogs.Where(fun x -> x.creationDate.HasValue && x.creationDate.Value < now)
```

We need to establish if this is by design from the F# side and if it is not implement a fix on this side (I can take this) otherwise we (I) should focus on fixing EF core for 6.0.