The new LINQPad 6.0.16 Postgres driver not working
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I don't know the reason, but the test button in Entity Framework Core Connection is fine:

Comments
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LINQPad 5 seems working perfectly fine. -
This looks like a bug in the Npgsql EFCore scaffolder. Can you scaffold from Visual Studio?
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Turns out the error only appears in 3.0.0-preview8.19405.11, the current version(2.2.4) is good.