[build_runner] returns "Running build completed" without actually completing the build (just throwing a warning)

[iapicca]

running locally flutter pub run build_runner build I'm not encountering any issues,
but running it in github actions I come across this warning (imho should be more than a warning)

maps:
[INFO] Generating build script...
[INFO] Generating build script completed, took 531ms

[INFO] Precompiling build script......
[INFO] Precompiling build script... completed, took 12.5s

[INFO] Initializing inputs
[INFO] Building new asset graph...
[INFO] Building new asset graph completed, took 1.1s

[INFO] Checking for unexpected pre-existing outputs....
[INFO] Checking for unexpected pre-existing outputs. completed, took 1ms

[INFO] Running build...
[INFO] Generating SDK summary...
[INFO] 3.3s elapsed, 0/13 actions completed.
[INFO] 5.8s elapsed, 0/13 actions completed.
[INFO] 7.0s elapsed, 0/13 actions completed.
[INFO] Generating SDK summary completed, took 7.0s

[INFO] 8.2s elapsed, 12/13 actions completed.
[INFO] 9.3s elapsed, 12/13 actions completed.
[INFO] 10.3s elapsed, 12/13 actions completed.
[INFO] 22.5s elapsed, 12/13 actions completed.
Warning:  No actions completed for 15.4s, waiting on:
  - riverpod_generator on lib/src/logic/map_controller.dart

[INFO] Running build completed, took 22.9s

[INFO] Caching finalized dependency graph...
[INFO] Caching finalized dependency graph completed, took 46ms

[INFO] Succeeded after 23.0s with 2 outputs (27 actions)

maps: SUCCESS

that translates in analyze error

Analyzing maps...                                               

  error • Target of URI hasn't been generated: 'package:maps/src/logic/map_controller.g.dart' • lib/src/logic/map_controller.dart:4:6 • uri_has_not_been_generated
  error • Undefined class 'MapControllerRef' • lib/src/logic/map_controller.dart:10:37 • undefined_class

2 issues found. (ran in 8.1s)

I can only assume that build_runner wrongly claimed to have completed the build

info

• Dart SDK Version: 3.0.6
• What package(s) from this repo you are using, and the version build_runner: ^2.4.6
• What builder(s) you are using: riverpod_generator
• Whether you are using ubuntu:latest in github actions (no issues on local macos)

I'll attach the pubspec, melos (see setup:codegen script) , and workflow files for completeness
bunch of yaml files.zip

riverpod_generator issue:

• [riverpod_generator] returns "Running build completed" without actually completing the build (just throwing a warning)  rrousselGit/riverpod#2766

[iapicca]

after some trouble shooting seems that the file is indeed generated and may be the analyzer yelling for no reason, closing the issue for now