Over the last year I use bluetooth speed sensor and bluetooth cadence sensor on TrainerRoad( my phone is samsung S9+) and everything worked fine.
Recently I bought another bluetooth heartrate sensor(Rythm 24), then I found that latency in Power field is quite often(most of the times the latency lasts for about 10 seconds) so I can not achieve my Target.
Finally I change the heartrate sensor to ANT+ mode(Samsung S9+ support ANT+) and then everything just works perfect again. So I think too much bluetooth device may cause power latency.