Inconsistent behavior when using bun in docker linux/amd64 vs linux/arm64 and npx on both

[Zenton]

What version of Bun is running?

1.2.14

What platform is your computer?

MacOS (building done via docker)

What steps can reproduce the bug?

See README.md in https://github.com/Zenton/bun-docker-repro/
It has the output and a script (./run.sh) to reproduce.

When running tailwindcss cli in a docker build, it passes when building linux/arm64 but not linux/amd64 (error below). Yet npx works on both.

The bunx version on linux/amd64 platform fails with:

> [4/4] RUN bun install --frozen-lockfile && bun run with-bunx:
0.114 bun install v1.2.14 (6a363a38)
0.171 Resolving dependencies
3.052 Resolved, downloaded and extracted [256]
3.077
3.078 + @tailwindcss/cli@4.1.7
3.078 + tailwindcss@4.1.7
3.078
3.079 44 packages installed [2.97s]
3.079
3.079 Blocked 2 postinstalls. Run `bun pm untrusted` for details.
3.116 $ bunx --bun @tailwindcss/cli -i ./input.css --minify
3.243 Resolving dependencies
4.280 Resolved, downloaded and extracted [156]
4.313 Saved lockfile
5.286 ≈ tailwindcss v4.1.7
5.286
5.377 Error: Cannot apply unknown utility class: px-6
5.384 error: script "with-bunx" exited with code 1

What is the expected behavior?

Should pass in both, as npx does.

What do you see instead?

No response

Additional information

No response

[190n]

This issue sounds similar to #19677. In that case, the root cause was that Rosetta is emulating some x86_64 instructions incorrectly in a way that happens to break Bun and not break Node.js. OP of that issue was able to work around the bug by disabling Rosetta (which I believe will make Docker use QEMU instead).

Are you using Rosetta in Docker Desktop? Check this setting:

If you're not using Rosetta, or if turning off Rosetta and then restarting Docker doesn't make this issue go away, then it's a different issue.