Non-Deadroot mob/summon death respawns you at bed

I did a normal Deadroot fight earlier and during it a tree assassin found it's way into the arena from outside and killed me which sent me to my bed instead of outside the arena. This also for some reason locked me out of getting any boss souls from Deadroot even though I did damage to it. (There's for some reason a file size limit of only 5MB so, here's a Youtube link to a video if you want it since Eric told me to record it. The FOV is pretty bad but still gets the point well enough I think, sorry about that though.) https://youtu.be/gtvmcr5Jg9E