When I die, the backpack gets put on the ground in rather weird locations. When I died from a Silverfish nest, couple meter under the surface, my backpack got placed OVER the surface, instead of right next to my grave; something similar happened the second time I died, way farther underground, and I lost it :( luckily there wasn't anything preciousssssss in it. I am not completely sure this second case was a bug in your coding, though: there's a tiny chance that the backpack got instead blown up and destroyed from the TNT zombies (damn DeadlyWorld). I'll have to test this further.

NOTE: I didn't try any other backpack than the cow one, as of the time of this writing.

It tries to place itself in the nearest possible one block space to the block where you were standing when you die, and up to 10 blocks away. Backpacks are inmune to explosions (or so I think). What does Deadly World do?

Deadly World generates a lot more spawners that do a bunch of things; one of them, for instance, will shot tons of arrows all around the place, and another one has got a "ghost zombie" standing on it. When you get near enough, the zombie "comes alive" and gets a primed TNT head to blow you up. That's how I died the second time ç_ç it also adds a crapton of silverfish nests everywhere, and that's how I died the first time...the pro to all this is that you get a reward, usually there's an interesting block in every silverfish nest and a chest under every spawner.
Maybe I lost it in the darkness of the cavern, or in an adiacent cavern hidden by a wall. I'll test this further, although I'd rather not die (lol).

Can you try to replicate this and try to pinpoint the situation when the backpack dissappears?

I'll try blowing myself up somewhere, that should do u.u I'll report to you later!

Apparently the backpacks ARE resistent to explosions, but if you get blown up they don't get placed. I am suspecting it could be a conflict with the Gravestone mod, although BetterStorage backpacks seem to behave properly. I'm about to try without that mod!

After a while dying in the most exotic of ways, only creepers and TNT fudged with the backpack ability to be placed. Quite an interesting thing I say. Been testing this for a while, now to try to find why.

Yep, confirming the bug: even after removing any grave-adding mod, the backpack still didn't get placed, it just disappeared. I tried with both a Cow backpack and a Deluxe backpack and both times they didn't place. Sure, if I place them by hand and then blow up the TNT they do not get destroyed, but if I get blown up it just disappears, somehow.
I tested it very simply by having a backpack on and detonating a TNT block under my feet or just next to me. I did it several times, so I think there's definitely no doubt, but you can try it yourself.

If you die any other way other than blowing up, do they get placed? Just to confirm that blowing up blows up the placement. (pun intended)

Didn't try any other way of dieing (?), to be honest, I only thought of it
AFTER closing my Minecraft and it takes too much time to reboot it ^^" at
least you could see it yourself, lol. Could a cause be that, blowing up,
you get flinged up into the sky and die mid-air? It sounds kinda like a
proper explanation to me...tomorrow I'll try jumping off a cliff and using
the command /kill mid-air.
Il giorno 16/dic/2014 22:39, "Javier Darkona" [email protected] ha
scritto:

After a while dying in the most exotic of ways, only creepers and TNT
fudged with the backpack ability to be placed. Quite an interesting thing I
say.

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#10 (comment)
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Fixed in the HUGE COMMIT OF EPIC GLORY