Hi, I have tested this now and found that the oil crates spawn and within seconds despawn. This all started after the 4th of February 2021 wipe. I am seeing no errors in my console and my config is still the same as it was before the wipe.

{
  "Settings": {
    "Use Teams": true,
    "Use Friends": true,
    "Use Clans": true,
    "Block damage another player's survey crater": true,
    "Block deploy a quarry on another player's survey crater": true
  },
  "Chat Settings": {
    "Chat Prefix": "[BackPumpJack]: ",
    "Chat Prefix Color": "#00FFFF",
    "Chat SteamID Icon": 0
  },
  "Permission List": [
    {
      "Permission": "backpumpjack.use",
      "Priority": 0,
      "Oil Crater Chance": 40.0,
      "Oil Crater Settings": {
        "Minimum pM": 5.0,
        "Maximum pM": 10.0
      },
      "Normal Crater Settings": {
        "Modify Chance (If not modified, use default mineral)": 0.0,
        "Minimum Mineral Amount": 2,
        "Maximum Mineral Amount": 6,
        "Allow Duplication Of Mineral Item": false,
        "Mineral Items": [
          {
            "Mineral Item Short Name": "stones",
            "Chance": 50.0,
            "Minimum pM": 120.0,
            "Maximum pM": 180.0
          },
          {                                               
            "Mineral Item Short Name": "metal.ore",
            "Chance": 50.0,
            "Minimum pM": 30.0,
            "Maximum pM": 50.0
          },
          {
            "Mineral Item Short Name": "sulfur.ore",
            "Chance": 50.0,
            "Minimum pM": 30.0,
            "Maximum pM": 50.0
          },
          {
            "Mineral Item Short Name": "hq.metal.ore",
            "Chance": 50.0,
            "Minimum pM": 5.0,
            "Maximum pM": 7.5
          }
        ]
      }
    },
    {
      "Permission": "backpumpjack.vip",
      "Priority": 1,
      "Oil Crater Chance": 40.0,
      "Oil Crater Settings": {
        "Minimum pM": 10.0,
        "Maximum pM": 20.0
      },
      "Normal Crater Settings": {
        "Modify Chance (If not modified, use default mineral)": 50.0,
        "Minimum Mineral Amount": 3,
        "Maximum Mineral Amount": 6,
        "Allow Duplication Of Mineral Item": false,
        "Mineral Items": [
          {
            "Mineral Item Short Name": "stones",
            "Chance": 50.0,
            "Minimum pM": 120.0,
            "Maximum pM": 180.0
          },
          {
            "Mineral Item Short Name": "metal.ore",
            "Chance": 50.0,
            "Minimum pM": 15.0,
            "Maximum pM": 25.0
          },
          {
            "Mineral Item Short Name": "sulfur.ore",
            "Chance": 50.0,
            "Minimum pM": 15.0,
            "Maximum pM": 15.0
          },
          {
            "Mineral Item Short Name": "hq.metal.ore",
            "Chance": 50.0,
            "Minimum pM": 1.5,
            "Maximum pM": 2.0
          }
        ]
      }
    }
  ]
}​

In my tests, everything is ok, please check the other plugins

Which ones? As I said nothing was changed and it has been like this since the Facepunch Update. So I am not sure how or which plugins could be causing the problem.

Try unloading plugins one by one...