I wrote a simple rule app (RM 5.1) just to make sure the "Repeat" and "Cancel Rule Timers" commands were working as I expected and it turned out, maybe it wasn't.
I set the rule up to initially "Cancel Timed Actions This Rule" and then to do a repeat 3 times loop, followed by an IF statement.
I expected it to cancel the "Repeat loop" if it was invoked a second time while it was already running--but to then do the "Repeat 3 Time" loop anew. However, from what I see, the second invocation only executed the Repeat Loop once before Exiting with the END-REP.
Is that to be expected?
Note that when I ran the rule one time after this, it behaved properly again--so the issue seems to surface only when a previous execution is interrupted.