Reproduced.

Using the sample code below, and reference these property in DocC's Topics.

A/id and C/description are fine. B/id and C/id are complaining -> "Topic reference 'B/id' couldn't be resolved to known documentation"

public struct A {
    public var id: String
}

public struct B: Identifiable {
    public var id: String
}

public struct C: CustomStringConvertible, Identifiable {
    public var id: String
    public var description: String
}

I'm investigating the code to find what's wrong.

Xcode Version 13.3 (13E113)

Probably related:

Topic reference 'Web3/Utils/erc20ABI' couldn't be resolved. No local documentation matches this reference.

Breakdown

erc20ABI is a public static var declared in an extension of Web3.Utils which is a struct.
The Web3.Utils is declared in an extension.

public struct Web3 {
}

extension Web3 {
    public struct Utils {
    }
}

extension Web3.Utils {
    /// Note that this variable does have a documentation comment, but it's not resolved.
    public static var erc20Abi = "some value here"
}

But at the same time, this variable is resolved by Xcode and by Cmd+Click can navigate to the declaration source.

All 3 examples in this thread work for me in the latest main and 5.9 builds of DocC.

Feel free to reopen this issue and add more examples if there are cases where this doesn't work with the latest main or 5.9 builds of DocC.