Build continues after errors in some of the components

Building https://gitlab.com/tristanvb/buildstream-tests/commit/5e20e04577580c4f56f62f59956a6d4b8d5b7ded triggered some errors (which are now fixed), but the show status executed after that shows that the build continued:

sh-4.3# build-stream show --deps all build-essential.bst
      gnome-platform: 7b86d9adda47b7e17c1b9c419e85355f35f7eb1643348b5ffc694d1021db38f0 (cached)
           gnome-sdk: bfe7dafec7555e417fcec60525c4042a38ea1abfc8ddd8dd03d8950a162e664d (cached)
     stage1-binutils: d92564efa61ee5424d95e7eb6688b6c176633b7de07941d608e6036bd4c14bcf (cached)
          stage1-gcc: fa57f87dbbc5309474cbb66f0449e0fd093f52d42d86dfc8bcfc55b1e9d42274 (cached)
              stage1: 402d08fa51449a5d3fde185fc61459d412fa678eae5898f59c4cd00feb87d0b8 (cached)
stage2-linux-api-headers: a46017e2faa5618cfc7f3eb6b56d4aef931d757660f39c56bde1e9020efc1939 (cached)
        stage2-glibc: 62064d973a4c98ab50d230d219d71cf1a594ee0afdd7c71350a102b1fdc0ee60 (cached)
     stage2-binutils: 8f11da1c335a1b5daa4a51573225b0c1f680799dc0f827dca0cbb679a1595002 (cached)
      stage2-busybox: 5f818c25647c06493c0de74e711f6040a4d92583232149531f7cde05c03a3f3d (cached)
     stage2-fhs-dirs: df5dc158e4e4f5cd3b3f74d5a445bf219a2e645eba902faf4969cb042a36e4b0 (cached)
         stage2-gawk: a096f339bb9305aa3d1176be95545dfbe8dcbc79e68d4bc8c4f68597ad5e8483 (cached)
stage2-gcc-fixed-headers: d9700dda5be40f7ca737d2a03c9c29102e9ca9e70834e9a582f47a50782646b5 (cached)
    stage2-libstdcxx: 9079ffae09dce12546350243fabf812be5e3da3e549120c43bd87960d105aad7 (cached)
          stage2-gcc: 94671d0071b01636cc018dd311185d2e52303e44aa23b3d8326f4a4b5992dcc7 (cached)
         stage2-make: e68cfcad15f664b7e75350532ee584e5ed4395a56b4a1a9d7ab1617be746c8b9 (cached)
  stage2-reset-specs: 561d392d18adae1a229f821cb53d51be8fd7e5597de9986958e3047cf9ae2f36 (cached)
              stage2: d9b4d323e91c1c628eef0f49fa3f7638b2b40c0c541fc0662d3a9183053da705 (cached)
   linux-api-headers: 74c1b2cda2c125fd94614c1f1c0c30b2ae4127d8dcca1fbee917717a05f011c4 (buildable)
               glibc: b2a9dffcb63660a9ec2a49e81234032a9fa4e0c0ca408060f767b2e1e33d3793 (waiting)
                zlib: 020c4231a9363bae6038905d261a5a39ef78000d06113ada693f2b839b440102 (waiting)
            binutils: 1b984826a20e6736231a9339e8bcc42a6767e2392454f889395932e8ce4391fb (waiting)
             busybox: d808d24648885ba1d3683a165e8b56b0791de7cc51973f285b39593ed540c6a4 (waiting)
              ccache: 57331614340c3e01a4a98262a6b286dc930570fcbb0fed20db1d4825e24ef03e (waiting)
            fhs-dirs: 91c8ae954de6a0bc79da86d09d8693a0cac5add900d214099ae20fd6422be2ca (buildable)
                gawk: ab3ab0c7676f203c43574f03647db0ef0f9d9fd7c63107472b68e3a1d357de9d (waiting)
          m4-tarball: 5d64f7df0658f105e5e170ec0aaaec42ff933dcca1a8459ac97edaecf40d3b4f (waiting)
                 gcc: 8251ac83632d0807906a7428d505671a5f81d1b9d9dead94a53b7966119f2bd0 (waiting)
                make: c2ee53ed1f6c44fd305abc0fa289ac508de7b17fd798c7aa0d0329a281a4e604 (waiting)
     build-essential: 0dcced8ae39caa0bde81f8800da41adf78b67e74b7f532c093fc782ba13aa978 (cached)

I believe that "build-essential" component should have never being built.