Sometimes rule types can change between versions of SonarQube – when that happens, issues which have already been raised don’t have their type changed. This is the case for both these rules (see SONARJAVA-3485 and SONARJAVA-3484).
We recognize this can be misleading (and that existing projects don’t fully benefit from the adjustments we do). We’ll add your feedback so hopefully this can someday be prioritized.
In the meantime you might benefit from the Bulk Change feature available on the global issues page, after filtering to the rule in question (to update the rule type of existing rules)