The precompiled query feature (#25009) statically analyzes user code, and generates interceptors for static LINQ queries; this is necessary for NativeAOT. This cannot happen in a Roslyn source generator (as is usual), since query processing requires the EF model, which cannot be built/accessed in the Roslyn context.

As a result, we are planning to perform this process via msbuild integration, most likely as part of publishing (this is already where the very lengthy NativeAOT compilation takes place, etc.).