Hello, when I mine blocks, let's say a cobblestone with a pickup upgrade, then they are added two at a time, but if I combine them, throw them out and pick them up, then they are already normally combined
Version of game and mod: 1.16.5-3.15.19.721
Version of forge: 36.2.39

How it works:

How it should

A mod in your modpack is causing the items to have different data when they are picked up. You will need to figure out which one and remove if you want to fix. I don't support 1.16.5 for at least 2 years now so can't grt you more help than that

is it possible to sort the backpack automatically in survival, would that solve the problem?

There's no such functionality in the mod and I am not going to add it so no. You can of course go ahead and play with the mod in newer versions where this mod that was causing the issue doesn't seem to exist.

A mod in your modpack is causing the items to have different data when they are picked up. You will need to figure out which one and remove if you want to fix. I don't support 1.16.5 for at least 2 years now so can't grt you more help than that

There's no such functionality in the mod and I am not going to add it so no. You can of course go ahead and play with the mod in newer versions where this mod that was causing the issue doesn't seem to exist.

Why won't you add it to the mod? it would be possible (on new versions) to make a type of next level (diamond, for example) for pickup upgrade

That functionality doesn't make sense because it's basically a functionality that "fixes" another mod's bug. An even if I was adding it it would be at the very least 1.20+

Why wouldn't you just sort at that point. I mean it's one middle click.
I am definitely not implementing auto sort because of this even if it was on a toggle off by default because that could make players toggle it on more often than needed (which I still doubt when it would be needed) and server performance would tank just because of the constant comparisons of the stacks and figuring out if everything needs to move around.

That functionality doesn't make sense because it's basically a functionality that "fixes" another mod's bug. An even if I was adding it it would be at the very least 1.20+

I suggest doing this on the latest versions, since I realized that you won't do it on the old ones.
and yet, why it can be convenient, not because it fixes a bug, but because, let's say, we have blocks, artifacts and tools in a mess and we need to take something and have to run our eyes all over the backpack, and when there is an auto-sorting, we won't have to do it, everything will be more clearly

Why wouldn't you just sort at that point. I mean it's one middle click. I am definitely not implementing auto sort because of this even if it was on a toggle off by default because that could make players toggle it on more often than needed (which I still doubt when it would be needed) and server performance would tank just because of the constant comparisons of the stacks and figuring out if everything needs to move around.

because after selecting each resource, you need to go in and sort, it would be a chore
to do the sorting once every 15 seconds or similar

Why wouldn't you just sort at that point. I mean it's one middle click. I am definitely not implementing auto sort because of this even if it was on a toggle off by default because that could make players toggle it on more often than needed (which I still doubt when it would be needed) and server performance would tank just because of the constant comparisons of the stacks and figuring out if everything needs to move around.

because after selecting each resource, you need to go in and sort, it would be a chore

to do the sorting once every 15 seconds or similar

Just to be clear I commented on your point that when you need to take something out of backpack it would be beneficial to have it already sorted. I don't think you need to do that every 15 seconds.