intellij: code navigation broken on project with custom toolchain and `--incompatible_enable_cc_toolchain_resolution --action_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1`

We have a project where we configured a custom toolchain (using clang as executable on posix) skipping the auto-configured one by bazel. We are setting the --incompatible_enable_cc_toolchain_resolution and --action_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1. On this project the intellij bazel pluging prints the following warning when synced:

Warning:Unable to access compiler executable
  "<path to bazel cache>/execroot/__main__/external/local_config_cc/gcc".
Check if it is accessible from the cmdline.

and as a consequence, code navigation is more or less completely broken. We do have a workaround, which is to link symbolically clang to the location indicated by the warning, but that’s not ideal.

I managed to reduce our case to a rather small project presenting the same warning (on Linux with gcc). You can find it here:

https://github.com/redsun82/foo

I noticed dropping --action_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1 removes the warning, but my guess is that in that case the plugin will then use the host auto-configured compiler instead of the custom one.