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    • Confirmed
    • Datafixer, Performance
    • Very Important
    • Platform

      Upgrading worlds from 1.20.4 to 1.20.5-pre4 can cause significant lag. This appears to be caused by suspicious blocks (sand and gravel) and likely others, that previously stored minecraft:air item to represent no item, but since 24w09a? expect the item field to not be present instead.

      The attached test world contains a big suspicious sand cube, which causes a lot of log spam. But the same can be observed in regular worlds, where builders or world generation make use a lot of these blocks for texturing purposes.

      Steps to reproduce:

      1. Open the attached world in 24w09a? or later
      2. Observe that it takes a couple of seconds
      3. Check your log for spam of:
        Tried to load invalid item: 'Item must not be minecraft:air'
      4. Open the world again and observe it loading faster without log spam

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          MoJira is migrating! Ensure your account and info transfer by filling out the form here: aka.ms/MojiraMigration by 7th February

            • Confirmed
            • Datafixer, Performance
            • Very Important
            • Platform

              Upgrading worlds from 1.20.4 to 1.20.5-pre4 can cause significant lag. This appears to be caused by suspicious blocks (sand and gravel) and likely others, that previously stored minecraft:air item to represent no item, but since 24w09a? expect the item field to not be present instead.

              The attached test world contains a big suspicious sand cube, which causes a lot of log spam. But the same can be observed in regular worlds, where builders or world generation make use a lot of these blocks for texturing purposes.

              Steps to reproduce:

              1. Open the attached world in 24w09a? or later
              2. Observe that it takes a couple of seconds
              3. Check your log for spam of:
                Tried to load invalid item: 'Item must not be minecraft:air'
              4. Open the world again and observe it loading faster without log spam

                    gegy1000 [Mojang] Gegy
                    DrexHD DrexHD
                    Votes:
                    2 Vote for this issue
                    Watchers:
                    1 Start watching this issue

                      Created:
                      Updated:
                      Resolved:
                      CHK:

                        gegy1000 [Mojang] Gegy
                        DrexHD DrexHD
                        Votes:
                        2 Vote for this issue
                        Watchers:
                        1 Start watching this issue

                          Created:
                          Updated:
                          Resolved:
                          CHK: