Hi,
This rule is uses ESLint implementation (no-return-await - Rules - ESLint - Pluggable JavaScript linter) and indeed it’s mentioned there that one should not use the rule if one wants the function to appear in the stacktrace.
So I believe we rushed to include this rule in the default profile. Here is a ticket to update rule description and remove it from default profile Remove S4326 from default profile and improve its description · Issue #2674 · SonarSource/SonarJS · GitHub.
Thanks!