No completion (or hover?) in C# code in a lambda in an explicit expression in an attribute

Noticed in watching @danroth27 on the community standup.

Timestamp link: https://youtu.be/IXU3hbnaX50?t=1495

No completion is shown, and if you keep watching, no hover. Semantic tokens are correct though:


Start by reviewing the linked community standup timestamp and the attached image to reproduce the C# lambda inside an explicit expression in an attribute. Compare completion and hover behavior with the reported semantic tokens; done means both completion and hover are available in that scenario.

Written by the indexing model from the issue text.