Intellisense for F# external SqlDataConnection type provider broken in v16.10.0

_This issue has been moved from [a ticket on Developer Community](https://developercommunity.visualstudio.com/t/Intellisense-for-F-external-SqlDataConn/1437700)._

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[severity:I'm unable to use this version] [regression] [worked-in:16.9.5 or 16.9.6 (on a colleague's PC)]
Project A exposes an SqlDataConnection type provider, and compiles
Project B references the type provider from project A, and compiles

However, in VS editor and error list, everything from project A (even the namespace) is "not defined".

See attached solution to reproduce (hopefully)

The DummyDB just contains one table:
CREATE TABLE [dbo]. [DummyTable] (
[Id] [int] NOT NULL,
[Name] [nvarchar] (50) NOT NULL,
CONSTRAINT [PK_DummyTable] PRIMARY KEY CLUSTERED

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### Original Comments

#### Feedback Bot on 6/1/2021, 00:04 AM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

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### Original Solutions
(no solutions)