Seems very random, but I too am experiencing this quite often. Sometimes after a round has ended and you go into build phase, when I swap to a dif hero the hero I swap to dies. Happens during combat phase too.

this same issue has happened to me alot recently but the hero doesn't die

I've had to happen where the character doesn't actually die. Never actually died from the issue

I noticed that most of the times, for me, it will spawn you back where you died, and sometimes back at spawn (maybe when it can't spawn you back where you were). This bug also occurs in the Public Tavern.

Happens quite often for me, or sometimes the character model dissappears, just leaving the weapon equipped visable, and unable to use abilities/build defences. I find that this happens more commenly when playing on poor connection (downloading through steam or over capacity network)

Bug is not fixed, it still happens when you have a slower internet connection.

ive had something similar though my character never dies from it. instead i get a jarring gong ringing for the death sound and my screen shakes briefly showing a 0 second respawn timer but my character does still switch at full health. not actually dying.

It still happens when two heroes have a big difference of health and quick swap between them

nor fixed