Phabricator: HEAD detached from dc0f

I’m using Phabricator and Arcanist CLI to attempt to land a diff that has been approved by a code reviewer. Here is the output I see:

 arc land
 STRATEGY  Merging with "squash" strategy, the default strategy.
 SOURCE  Landing the current branch, "branchName".
 ONTO REMOTE  Landing onto remote "origin", the default remote under Git.
 ONTO TARGET  Landing onto target "master", the default target under Git.
 INTO REMOTE  Will merge into remote "origin" by default, because this is the remote the change is landing onto.
 INTO TARGET  Will merge into target "master" by default, because this is the "onto" target.
 FETCH  Fetching "master" from remote "origin"...

  $   git fetch --no-tags --quiet -- origin master

 INTO COMMIT  Preparing merge into "master" from remote "origin", at commit "62210e8removed".
 LANDING  These changes will land:

  *   D4303 Revert to reviewed state
          dc0f50removed  fix checkbox error

 >>>  Land these changes? [y/N/?] y
 MERGING  dc0f50removed fix checkbox error
 MERGE  Attempting to rebase changes.
 DONE  Merge succeeded.
 LOAD STATE  Restoring local state (to ref "branchName" at commit "dc0f50removed").
[2021-08-04 20:34:32] EXCEPTION: (CommandException) Command failed with error #1!
git commit --author 'MyName' --date 'Tue, 3 Aug 2021 10:46:43 -0400' -F - --

HEAD detached from dc0f50removed
nothing to commit, working tree clean

(empty) at [<arcanist>/src/future/exec/ExecFuture.php:421]
arcanist(head=master, ref.master=f0f95e5b2612)
  #0 ExecFuture::raiseResultError(array) called at [<arcanist>/src/future/exec/ExecFuture.php:325]
  #1 ExecFuture::resolvex() called at [<arcanist>/src/land/engine/ArcanistGitLandEngine.php:1796]
  #2 ArcanistGitLandEngine::applyCommitOperation(string, string, string) called at [<arcanist>/src/land/engine/ArcanistGitLandEngine.php:510]
  #3 ArcanistGitLandEngine::executeMerge(ArcanistLandCommitSet, string) called at [<arcanist>/src/land/engine/ArcanistLandEngine.php:1248]
  #4 ArcanistLandEngine::execute() called at [<arcanist>/src/workflow/ArcanistLandWorkflow.php:344]
  #5 ArcanistLandWorkflow::runWorkflow(PhutilArgumentParser) called at [<arcanist>/src/workflow/ArcanistWorkflow.php:227]
  #6 ArcanistWorkflow::executeWorkflow(PhutilArgumentParser) called at [<arcanist>/src/toolset/ArcanistPhutilWorkflow.php:21]
  #7 ArcanistPhutilWorkflow::execute(PhutilArgumentParser) called at [<arcanist>/src/parser/argument/PhutilArgumentParser.php:492]
  #8 PhutilArgumentParser::parseWorkflowsFull(array) called at [<arcanist>/src/runtime/ArcanistRuntime.php:171]
  #9 ArcanistRuntime::executeCore(array) called at [<arcanist>/src/runtime/ArcanistRuntime.php:37]
  #10 ArcanistRuntime::execute(array) called at [<arcanist>/support/init/init-arcanist.php:6]
  #11 require_once(string) called at [<arcanist>/bin/arc:10]

I do not believe the feature branch should be in a detached head state. I’ve checked it out by name. Here is the git log:

$ git log
commit dc0f5074b0cfce35525c9799bfremoved (HEAD -> branchName)
Author: name email
Date:   Tue Aug 3 10:46:43 2021 -0400

    fix checkbox error
    Summary: todo
    Test Plan: todo
    Reviewers: #reviewers_js, #reviewers_default
    Differential Revision:

Any idea why this error displays?

Solved by merging origin/master into feature

Continuing the discussion from Phabricator: HEAD detached from dc0f: