Many paused jobs without progress when using TuneBOHB

I’m trying to limit the number of concurrent trials (my understanding is that concurrent is Paused + Running, is this correct?); however, setting max_concurrent_trials inside of TuneConfig, setting max_concurrent inside of the search_alg, and using a ConcurrencyLimiter still results in tune launching a seemingly infinite stream of PAUSED trials and only ever running a single iteration on any given job-- I have also tried setting batch=True in the ConcurrencyLimiter to no avail. I have yet to see it run 2+ iterations on any single trial.

I’m not sure what I should do to prevent it from launching so many Jobs that just sit in the PAUSED state. Any help would be greatly appreciated.

The problem seems to be isolated to the HyperBandForBOHB scheduler.
I was running it like this:

    search_alg = TuneBOHB(metric='loss', mode='min')
    search_alg = ConcurrencyLimiter(search_alg, max_concurrent=num_workers*2, batch=True)
    scheduler = HyperBandForBOHB(

@wyn Which Ray version are you running with?