This was broken by commit a1830c03a50ad38ec3f857a2a8b88498d1bf5e54 ("ntdll: Add a separate helper to build the main module on Wow64."). `init_wow64()` is called on thread creation, and each new thread was re-creating the main module and `ntdll`. `+relay` seemed to be the only functionality broken by this.
That commit also made a helper which calls `NtQueryVirtualMemory(LdrInitializeThunk,MemoryBasicInformation)`, but didn't remove the original call.