Unlocking Cost set as Item doesn't seem to work

[kris19pr]

Minecraft 1.21.10 and Universal Graves 3.9.1

When I configure the unlocking cost as presented on the configuration page the mod rewrites that part of the file making it look like this:

},
"interactions": {
"unlocking_cost": {
"type": "item",
"input": "minecraft:dirt",
"count": 1
},
"give_death_compass": false,
"enable_use_death_compass_to_open_gui": false,
"enable_click_to_open_gui": true,
"shift_and_use_quick_pickup": true,
"break_quick_pickup": true,
"allow_remote_protection_removal": true,
"allow_remote_breaking": true,
"allow_remote_unlocking": false
},

But while testing the grave shows the locked icon, the required item and quantity but it doesnt show the button to pay for it. It only shows the Destroy icon, which defeats the purpose of having to pay to unlock it, and the two arrows icons. I tried many times but no luck

Edit:
Setting the unlocking cost to levels doesn't work either

[kris19pr]

I was testing the mod on singleplayer, I opened the singleplayer to LAN so it behaves as a server and now it is working, yet still I cant find a way to disable breaking the graves or disabling the items dropping when the graves is broken by the owner or player because there's no point on having a cost to unlock the grave and being able to just break the grave an have all the items

[kris19pr]

I found a way to accomplish the desired behavior for my use case. It's about tweaking the settings. I will share the used settings shortly...