The curve25519-dalek crate before 4.1.3 for Rust has a constant-time operation on elliptic curve scalars that is removed by LLVM.
When this bug was created, `rust-curve25519-dalek` was already 4.1.3 on all supported distros. The only tickets raised were for `atuin` package, for which I confirmed that it used 4.1.3 since the start of the import. Probably the tooling failed on this one.