[Bug] Not able to change start time of a completed fast on beta app

When I try to change the start time of any completed fast, it reverts back to whatever the original time had been. This is on the Apple beta app 3.8.0.

I can change the end time just fine, I can add notes, I can change the hours (which adjusts the end time only) but it won't let me change the start. And the start time I'm trying to enter does not conflict with another logged fast.

I'm pretty sure it works on the web app, but figured I'd report the glitch. Edit: works fine on web.