Timemachine/minecraft_protocol
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verify pass 2: resolve markers via ViaBackwards/ViaRewind/ViaLegacy

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Closed most remaining UNCONFIRMED items + caught corrections: 1.7 data[]=proto5,
1.8 multi-block nibble order (z/x), stance y+1.62, 1.15 wolf idx18=begging,
1.18 below-zero sections NOT stripped (claim was wrong), CONTAINER_SLOT_STATE
1.20.3, + pinned first-appeared versions (report details/server links=1.21,
fluidCount=26.1, block-state id14=1.19.4, itemCount VarInt=1.20.5).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
claude-timemachine
2026-06-19 19:13:19 +02:00
parent e4ab541200
commit 02a249a379
10 changed files with 42 additions and 62 deletions
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packets/format-chunk-data.md
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@@ -87,7 +87,7 @@ Source: `ChunkSectionType1_18.java:49-63` — reads `Short` non-air count, then
- **`blockStates`** — paletted container over **4096** entries (one per block in the 16³ section). Entry = a **block-state** global-registry ID, not a block ID. Cell index ordering is **YZX**: `index = (y<<8) | (z<<4) | x` (`ChunkSection.java:39`).
- **`biomes`** — paletted container over **64** entries (4×4×4 sub-grid; one biome per 4³ cell). Entry = a biome registry ID. *This container did not exist before 1.18* — biomes lived in a flat chunk-level array (§3).
<!-- UNCONFIRMED: the latest wiki (1.21.9-era) shows a second `Short fluidCount` field after `blockCount` in the Chunk Section — ViaVersion exposes ChunkSection.getFluidCount() "Available with versions 26.1+" (ChunkSection.java:67-73). For 1.18–1.21.x there is exactly ONE Short (blockCount) before the block-states container. -->
**26.1+**: A second `Short fluidCount` field is added after `blockCount` in each Chunk Section. Confirmed: `ViaVersion/.../api/type/types/chunk/ChunkSectionType26_1.java` reads `buffer.readShort()` for `nonAirBlocksCount` then `buffer.readShort()` for `fluidCount` (line 43–44). This type is registered in `Protocol1_21_11To26_1` — i.e. protocol 26.1 is the version following MC 1.21.11. For 1.18–1.21.11 there is exactly ONE Short (`blockCount`/`nonAirBlocksCount`) before the block-states container.
### 1.3 Block Entity (the array after `data`)
@@ -290,7 +290,7 @@ Source: minecraft-data `1.17` vs `1.18` `packet_map_chunk`; ViaVersion `ChunkTyp
- **1.21.x**: `trustEdges` removed from the chunk packet (minecraft-data `1.21.1/packet_map_chunk` has no `trustEdges`); packet ID shifted to `0x27`. heightmaps switched to **anonymous** (network/unnamed) NBT (`anonymousNbt`).
- **1.16**: the data-array packing changed from "entries-can-span-longs" to the **padded "no entry spans two longs"** form (§2.4) — a silent but decoder-breaking change with no field-list delta.
- **26.1+**: a second `Short fluidCount` is added to each Chunk Section (ViaVersion `ChunkSection.getFluidCount` "Available with versions 26.1+", `ChunkSection.java:67-73`). <!-- UNCONFIRMED for exact protocol/version number; flagged in §1.2 -->
- **26.1+**: a second `Short fluidCount` is added to each Chunk Section. Confirmed via `ChunkSectionType26_1.java` (reads two `readShort()` calls) and `Protocol1_21_11To26_1.java` (uses `ChunkType26_1`). Source: `ViaVersion/.../api/type/types/chunk/ChunkSectionType26_1.java`; see §1.2 for detailed layout.
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