I would LOVE to jump on the Studio One train, because from my testing, it's an awesome DAW with a super fast workflow. I've seen people suggest workarounds, like duplicating the track, but I'm not super interested in that. My audio settings are fine, my latency is low, I know what I'm doing, I'm good.

This issue is also documented in previous versions of Studio One according to my research, by this guy:

It would be one thing if the kick had the transient leftover every single time the automation happens, but it doesn't! It changes over time, randomly. The weirdest part is, as you watch, you'll see that the automations are not consistent. The synth audio clip in the video, when automating a filter plugin's cutoff frequency, sweeps downwards and upwards when it should be instantly up or down (you shouldn't be able to hear the filter moving) The kick drum in this example, when automating the audio track's volume, has leftover transient audio when there should be total silence. You can see that immediate automations, which are immediate and consistent in any other DAW give or take a few milliseconds, are anything but in Studio One. The automation is inconsistent and inaccurate, to put it simply. Studio One is awesome, and I really want to purchase it, but I can't in good conscience because the automation envelopes are totally broken.

Fabfilter volcano sweep