Problem: nondeterministic account set occurs with more stm workers

[mmsqe]

Closes: #XXX

Description

---

For contributor use:

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer

---

For admin use:

• Added appropriate labels to PR (ex. WIP, R4R, docs, etc)
• Reviewers assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.54%. Comparing base (0e0baa4) to head (7f124a1).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #510   +/-   ##
========================================
  Coverage    61.54%   61.54%           
========================================
  Files          128      128           
  Lines         9503     9503           
========================================
  Hits          5849     5849           
  Misses        3113     3113           
  Partials       541      541