Specifically, `--standalone` has been replaced with `--umd`: https://github.com/chjj/bpkg/commit/04ec2555a2a6392391dddbcf4915cfa1944218db#diff-04c6e90faac2675aa89e2176d2eec7d8
Specifically,
--standalonehas been replaced with--umd:chjj/bpkg@04ec255#diff-04c6e90faac2675aa89e2176d2eec7d8