cargo miri setup failing on custom target

[bindsdev]

I am attempting to use Miri in a bare metal project using my custom target. When I run cargo miri setup --target MY_TARGET, it prepares a sysroot for the target, but fails with:

error[E0464]: multiple candidates for `rmeta` dependency `core` found
 --> /home/binds/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/rustc-std-workspace-core/lib.rs:4:9
  |
4 | pub use core::*;
  |         ^^^^
  |
  = note: candidate #1: /tmp/.tmpSCntaC/target/x86_64-prestige/release/deps/libcore-5484c1dfc1494680.rmeta
  = note: candidate #2: /tmp/.tmpSCntaC/target/x86_64-prestige/release/deps/libcore-fe8fccd3bdf8e7b3.rmeta

For more information about this error, try `rustc --explain E0464`.
error: could not compile `rustc-std-workspace-core` due to previous error
fatal error: failed to build sysroot: sysroot build failed

I am at a loss for what could be causing this. Even if I cargo clean, the same error occurs. I will put anything I believe relevant to help solve this:

rustc -vV:

rustc 1.69.0-nightly (e972bc808 2023-01-29)
binary: rustc
commit-hash: e972bc8083d5228536dfd42913c8778b6bb04c8e
commit-date: 2023-01-29
host: x86_64-unknown-linux-gnu
release: 1.69.0-nightly
LLVM version: 15.0.7

My custom target:

{
    "llvm-target": "x86_64-unknown-none",
    "data-layout": "e-m:e-i64:64-f80:128-n8:16:32:64-S128",
    "arch": "x86_64",
    "target-endian": "little",
    "target-pointer-width": "64",
    "target-c-int-width": "32",
    "os": "none",
    "executables": true,
    "linker-flavor": "ld.lld",
    "linker": "rust-lld",
    "panic-strategy": "abort",
    "disable-redzone": true,
    "features": "-mmx,-sse,+soft-float",
    "code-model": "kernel",
    "pre-link-args": {
        "ld.lld": [
            "--gc-sections",
            "-T.cargo/linker.ld"
        ]
    }
}

It seems like JSON targets began to be supported as of #2744, so I don't think its an issue with Miri's support for it.

.cargo/config.toml:

[unstable]
build-std = ["core", "compiler_builtins", "alloc"]
build-std-features = ["compiler-builtins-mem"]

rust-toolchain.toml:

[toolchain]
channel = "nightly"
components = ["rust-src", "rustfmt", "clippy", "miri"]

[RalfJung]

The error looks similar to #2705... Does 'cargo miri setup' without --target work?

[bindsdev]

The error looks similar to #2705... Does 'cargo miri setup' without --target work?

No, it does not (x86_64-unknown-linux-gnu)

[RalfJung]

So, exact duplicate of #2705?

In that case please post over there with your OS details, and the output of cargo miri setup -v. I am at a complete loss about what might be causing this but maybe there's a pattern...