Hello! I have found a bug with the mod installed alone (latest version). When the inventory gets updated, so does all the items in it, this causes a weird bug where new picked up items come with no tag and does not stack with others. I suck at explaining things in english so here is how to easily reproduce:

• Dig some dirt, pick it up,
• Move the dirt you picked up to another slot in your inventory,
• Dig another dirt, it won't stack with the first one.

Sadly the latest patch did not fix the issue it seems, @MikulDev :(
Items can now be stacked, but the behavior when updating the inventory, and mining another block still causes the non-stacking issue.

Same issue, seems unaffected by other mods

Duplicate of #232. This will be fixed in the next update.