When mixed with the free strategy (or any custom strategy that does not behave in
a lock-step manner), the linear methodology of _wait_on_handler_results may cause
race conditions with regular task result processing if the strategy uses
_process_pending_results directly. This patch addresses that by splitting the queues
used for results and adding a flag to _process_pending_results to determine which
queue to check.
Fixes#69457
a4072ad0e9