Hi I was playing on my server with someone and everything was fine until we noticed lootr chests couldn't be opened. The person I was playing with managed to kill a dragon from the Ice and Fire mod which was cool af because they're hard to kill but it was sad because they went over to where the dragon usually sits on all the gold and stuff where the chests are and the chests couldn't be opened at all.

Latest.log files:
latest.log
latest2.log

Dragon area where chests couldn't be opened:

There was also a lootr chest in a village nearby that couldn't be opened either. I also noticed when loot was dropped out of the inventory sometimes it would completely just disappear and not be an item on the ground to be picked up again at all. Also the modded minecraft version is 1.12.2.

There's a considerable amount of errors in the first log file that you provided:

[05:00:17] [Server thread/ERROR] [Lootr]: replacement TE net.minecraft.tileentity.TileEntityChest@81e7929 is not an ILootTile 0 at BlockPos{x=174, y=23, z=18}
[05:00:17] [Server thread/ERROR] [Lootr]: replacement TE net.minecraft.tileentity.TileEntityChest@4fc1bac5 is not an ILootTile 0 at BlockPos{x=187, y=25, z=10}
[05:00:17] [Server thread/WARN] [net.minecraft.server.MinecraftServer]: Can't keep up! Did the system time change, or is the server overloaded? Running 40013ms behind, skipping 800 tick(s)
[05:00:17] [Server thread/ERROR] [Lootr]: replacement TE net.minecraft.tileentity.TileEntityChest@21ed8d6a is not an ILootTile 0 at BlockPos{x=222, y=19, z=22}
[05:00:18] [Server thread/WARN] [net.minecraft.world.storage.loot.LootTable]: Tried to over-fill a container
[05:00:18] [Server thread/ERROR] [Lootr]: replacement TE net.minecraft.tileentity.TileEntityChest@53b75531 is not an ILootTile 0 at BlockPos{x=309, y=48, z=5}
[05:00:18] [Server thread/ERROR] [Lootr]: replacement TE net.minecraft.tileentity.TileEntityChest@6437060c is not an ILootTile 0 at BlockPos{x=340, y=31, z=18}
[05:00:18] [Server thread/WARN] [FML]: Battle Towers loaded a new chunk [20, -1] in dimension 0 (overworld) while populating chunk [21, 0], causing cascading worldgen lag.
[05:00:18] [Server thread/WARN] [FML]: Please report this to the mod's issue tracker. This log can be disabled in the Forge config.
[05:00:18] [Server thread/INFO] [STDOUT]: [atomicstryker.battletowers.common.AS_WorldGenTower:generate:538]: Dimension 0 Battle Tower type SmoothStone spawned at [ 336 | 0 ], underground: false
[05:00:18] [Server thread/ERROR] [Lootr]: replacement TE net.minecraft.tileentity.TileEntityChest@2185a4b9 is not an ILootTile 0 at BlockPos{x=346, y=20, z=10}
[05:00:18] [Server thread/ERROR] [Lootr]: replacement TE net.minecraft.tileentity.TileEntityChest@4bc12cea is not an ILootTile 0 at BlockPos{x=386, y=29, z=10}

These are probably the most significant, and, based on what happened a few seconds earlier in the mod, most likely are a result of Roguelike Dungeons causing cascading chunk loading which is overriding Lootr converted containers:

[05:00:12] [Server thread/WARN] [FML]: Roguelike Dungeons loaded a new chunk [-9, -4] in dimension 0 (overworld) while populating chunk [0, 0], causing cascading worldgen lag.
[05:00:12] [Server thread/WARN] [FML]: Please report this to the mod's issue tracker. This log can be disabled in the Forge config.
[05:00:14] [Server thread/INFO] [roguelike]: Trying to spawn dungeon with id builtin:grassland at {"x": 74, "y": 0, "z": 2}...
[05:00:14] [Server thread/WARN] [FML]: Roguelike Dungeons loaded a new chunk [3, -1] in dimension 0 (overworld) while populating chunk [0, 0], causing cascading worldgen lag.
[05:00:14] [Server thread/WARN] [FML]: Please report this to the mod's issue tracker. This log can be disabled in the Forge config.
[05:00:14] [Server thread/WARN] [FML]: Roguelike Dungeons loaded a new chunk [4, -1] in dimension 0 (overworld) while populating chunk [0, 0], causing cascading worldgen lag.
[05:00:14] [Server thread/WARN] [FML]: Please report this to the mod's issue tracker. This log can be disabled in the Forge config.
[05:00:14] [Server thread/WARN] [FML]: Roguelike Dungeons loaded a new chunk [5, -1] in dimension 0 (overworld) while populating chunk [0, 0], causing cascading worldgen lag.
[05:00:14] [Server thread/WARN] [FML]: Please report this to the mod's issue tracker. This log can be disabled in the Forge config.

Roguelike Dungeons seems to be mostly responsible for these issues. It's also possible that Lootr is performing conversions and then Roguelike Dungeons is "undoing" them, although it does seem exceedingly widespread.

In addition, the last half of the first file consists almost entirely of errors involving the network, most of which are being triggered by Ice & Fire.

The second log file doesn't contain any errors; I imagine most of your issues come from errors with world generation. Unfortunately, I can't provide any support beyond this for 1.12.2 as I do not develop for the version and, given the sheer quantity of mods, wouldn't even know where to begin with debugging.

I ended up doing a little bit of googling after posting this and saw this post #16 and noticed the Ice and Fire mod was on that list. Is it incompatible with this mod in terms of the chests?

Also sorry I found out the issue I had with items disappearing was actually just JEI's cheat mode thing that I left on by accident which I would've been doing testing with before playing and I'm guessing it probably transferred as enabled onto the server through config files aswell but who knows. I didn't know it was a feature and I was having so much fun with the person that I was playing with that I didn't even notice the text thingy too lolol but anyway just in case anyone has this problem and comes across this post just know JEI's cheat mode has a feature where it can delete items that you drag out of your inventory like when your dropping items to people and stuff. Just thought I'd say that in case it helps anyone.

That's specifically with the 1.16 and later versions of Ice & Fire, not the 1.12.2 version.

And yes, that's definitely part of cheat mode, although generally it's only if you drag items onto the actual JEI interface. Dragging them above or below the container shouldn't have that effect.

Ohh ok also I confirmed it was the JEI cheat mode doing it I was dragging stuff off to the left aswell away from the interface and it was happening it actually shows text saying that it's about to delete stuff too I just was doing it pretty fast and was having a lot of fun with the person I was playing with that I didn't actually realize it but anyway it was 100% the JEI cheat mode causing items to disappear when dropping them.

Also I'll be doing some testing with just Lootr and Ice and Fire and then introduce roguelike dungeons into the mix and see what happens because the stuff you said about roguelike dungeons is interesting and is probably causing the problems. I'm going to be testing it with and without pregenerating the world too. I'll get back to you here soon.

Anyway merry christmas man.

That's specifically with the 1.16 and later versions of Ice & Fire, not the 1.12.2 version.

And yes, that's definitely part of cheat mode, although generally it's only if you drag items onto the actual JEI interface. Dragging them above or below the container shouldn't have that effect.

Hello I seem to be having a similar issue with having chests being suddenly un-openable

Please open a new issue and provide the required information: latest.log from the server, the version of Minecraft you are running, the version of Lootr, and what mod loader you are using. Please do not comment in unrelated issues just because they sound similar.