I thought it was an issue with Slayer or something, so I tried enabling nothing but the default add-ons. I still have the issue.
If this was put in as a default feature that I never knew about, along with the bottom text about observers, I'm not really fond of it.

The only way to circumvent the issue is to wait for the character to stop tumbling and stand up naturally, then click. However if I plan to host a skiing server, people will generally not be patient enough to wait until they're done falling down a hill to avoid forcefully respawning.
I have experienced this in other servers as well.