Fit test CP–01 Curated crossing
Java 1.12.2 vs 1.13
Cut / context
The dated record assigns protocol 340 to Java 1.12.2 and protocol 393 to Java 1.13. Because those published protocol numbers differ, the workbench classifies a stock connection as Direct mismatch.
This comparison does not establish changes to saved worlds, extensions, or tooling. Check those separately against release-specific primary documentation before moving data or software between versions.
Measurement Published record
Side by side
| Fact | 1.12.2 | 1.13 |
|---|---|---|
| Published | 2017-09-18 | 2018-07-18 |
| Network protocol | 340 | 393 |
| Evidence state | published | published |
Fit result Deterministic protocol test
Handshake verdict
Direct mismatch
Protocol context
1.12.2 uses protocol 340; 1.13 uses protocol 393.
- The recorded protocols differ: 340 versus 393.
- Treat bridge support as Unknown until the server operator publishes dated, attributable evidence.
Uncertainty
A direct stock join does not match. A server-side translation layer may change the practical result, but version numbers alone cannot prove that one is installed.
Full records: 1.12.2 and1.13. Moving a world across this gap?Back up first.
Compiled 2026-07-14 from Mojang version manifest v2, minecraft.wiki protocol version record, PrismarineJS minecraft-data, ViaVersion documentation and repository.Curated comparison comparison-1.12.2-vs-1.13; last substantive change 2026-07-18; publication state published.