Although the new version is _mostly_ working without this error, it is coming up reliably when the following conditions are met: * using `@embroider/core@3.4.14` (or probably any other version pre 3.4.15, that hasn't https://github.com/embroider-build/embroider/pull/2075) * running the build with Embroider and _safe_ mode (optimized is working!) The root issue seems to be in Embroider, posting this here for visibility.