can't find crate for zerofrom_derive` in some nightly, beta builds

[theory]

Not sure if this is a zerofrom issue or the toolchain on some platforms. Example on FreeBSD i686:

   Compiling zerofrom v0.1.5
error: failed to run custom build command for `serde v1.0.217`

Caused by:
  process didn't exit successfully: `/target/release/build/serde-df453a18952b4011/build-script-build` (exit status: 1)
  --- stderr
  /target/release/build/serde-df453a18952b4011/build-script-build: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.33' not found (required by /target/release/build/serde-df453a18952b4011/build-script-build)
  /target/release/build/serde-df453a18952b4011/build-script-build: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by /target/release/build/serde-df453a18952b4011/build-script-build)
  /target/release/build/serde-df453a18952b4011/build-script-build: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found (required by /target/release/build/serde-df453a18952b4011/build-script-build)
  /target/release/build/serde-df453a18952b4011/build-script-build: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.39' not found (required by /target/release/build/serde-df453a18952b4011/build-script-build)
warning: build failed, waiting for other jobs to finish...
error[E0463]: can't find crate for `zerofrom_derive`
  --> /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/zerofrom-0.1.5/src/lib.rs:34:9
   |
34 | pub use zerofrom_derive::ZeroFrom;
   |         ^^^^^^^^^^^^^^^ can't find crate

error[E0432]: unresolved import `crate::ZeroFrom`
 --> /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/zerofrom-0.1.5/src/macro_impls.rs:9:5
  |
9 | use crate::ZeroFrom;
  |     ^^^^^^^^^^^^^^^

Some errors have detailed explanations: E0432, E0463.
For more information about an error, try `rustc --explain E0432`.
error: could not compile `zerofrom` (lib) due to 2 previous errors

Only happens on some targets, and only the beta toolchain, currently (though it was happening on nightly a couple days ago):

• i686-unknown-freebsd
• x86_64-unknown-freebsd
• aarch64-unknown-linux-musl
• arm-unknown-linux-musleabi
• powerpc64-unknown-linux-gnu
• powerpc64le-unknown-linux-gnu
• riscv64gc-unknown-linux-gnu
• s390x-unknown-linux-gnu
• sparc64-unknown-linux-gnu
• x86_64-unknown-netbsd
• x86_64-unknown-illumos