Issues

• [1.21.4+ -> 1.21.1-] Experiment minecart movement visual issue

  unconfirmed
  ViaVersion/ViaBackwards#1333 · Filter by author GADDQ opened on Sep 27, 2026
  5

• Allow declaring legacy color fallback for rgb text

  Feature Request
  ViaVersion/ViaBackwards#1331 · Filter by author roccodev opened on Sep 22, 2026

• Spear Fix

  bug
  ViaVersion/ViaBackwards#1314 · Filter by author ShihabUddinX opened on Sep 4, 2026
  8

• Item Components kick 1.21.x players in 26.2 servers

  unconfirmed
  ViaVersion/ViaBackwards#1310 · Filter by author dinhero21 opened on Aug 22, 2026
  1

• When using viabackwards on a proxy to connect to a 26.2 server i get the error clientbound/minecraft:custom_payload

  unconfirmed
  ViaVersion/ViaBackwards#1308 · Filter by author minecraftertjewout opened on Aug 14, 2026
  1

• Tropical fish bucket with bucket_entity_data and full variant components disconnects 1.21.11 clients on 26.1.x

  unconfirmed
  ViaVersion/ViaBackwards#1306 · Filter by author Alexteens24 opened on Aug 10, 2026
  1

• Item Display Entity (1.21.4 format) is invisible for 1.21.3

  unconfirmed
  ViaVersion/ViaBackwards#1255 · Filter by author Diner0l opened on Apr 25, 2026
  5

• Leaf Litter replaced to flower

  Feature Request
  ViaVersion/ViaBackwards#1230 · Filter by author sapbotgit opened on Mar 30, 2026
  2

• Dialog Bug

  bug
  ViaVersion/ViaBackwards#1199 · Filter by author goncalodelima opened on Feb 6, 2026
  1

• The item settings component in server version 1.21.11 is no longer working in version 1.21.1.

  unconfirmed
  ViaVersion/ViaBackwards#1177 · Filter by author craftorigin opened on Jan 9, 2026
  5

  

• Item flags not send to 1.9 on 1.21.8 server.

  unconfirmed
  ViaVersion/ViaBackwards#1125 · Filter by author thelipe7 opened on Oct 24, 2025
  1

• ItemFlags are not hidden on old clients

  unconfirmed
  ViaVersion/ViaBackwards#1121 · Filter by author Schneeeulen opened on Oct 17, 2025
  3

• Nametags are invisible for lower versions if Display Entities 1.19.4+ feature is used

  can't reproduceunconfirmed
  ViaVersion/ViaBackwards#1064 · Filter by author MorkaZ opened on Jul 10, 2025
  3

• Sneak desync on vehicle dismount. 1.21.1 client -> 1.21.4 server (2)

  unconfirmed
  ViaVersion/ViaBackwards#1045 · Filter by author Leymooo opened on Jun 24, 2025
  1

• Usage of FAWE commands makes other players disappear for 1.9.4 client

  unconfirmed
  ViaVersion/ViaBackwards#1014 · Filter by author Miiteee opened on May 20, 2025
  4

• Make turtle Shell green dyed leather helmet on 1.12 and under

  Feature Requestlegacy
  ViaVersion/ViaBackwards#992 · Filter by author Julmik647 opened on Apr 13, 2025
  1

• Jungle biome loads on 1.21 version but not in 1.8 when i set it with FAWE

  unconfirmed
  ViaVersion/ViaBackwards#1039 · Filter by author bronecek opened on Apr 12, 2025
  8

• 1.21.4 client -> 1.21.5 server error

  unconfirmed
  ViaVersion/ViaBackwards#987 · Filter by author MelonHell opened on Apr 10, 2025
  2

• Kick with many shulkers with items in inventory

  invalidunconfirmed
  ViaVersion/ViaBackwards#974 · Filter by author licen150 opened on Mar 26, 2025
  3

• Using 1.20.4 client on 1.21.4 server causes water ghosting

  unconfirmed
  ViaVersion/ViaBackwards#963 · Filter by author viimeinen1 opened on Feb 9, 2025
  2

• <1.12 version has strange sound of some NoteBlocks

  legacyPlausible
  ViaVersion/ViaBackwards#957 · Filter by author KozukiYOMA opened on Feb 3, 2025
  2

• Using mouse-middle as to move an item into the hotbar is having no effect

  bug
  ViaVersion/ViaBackwards#948 · Filter by author BlvckBytes opened on Jan 7, 2025

• Upgrading from 1.21.1->1.21.3 server breaks custom item compatibility

  unconfirmed
  ViaVersion/ViaBackwards#938 · Filter by author Kichura opened on Dec 18, 2024
  3

• 1.21.2/3 "components translation" (Goat horns) issue with earlier MC versions.

  unconfirmed
  ViaVersion/ViaBackwards#919 · Filter by author Athar42 opened on Nov 20, 2024
  4

• Maps in <1.13 aren’t shown

  legacy
  ViaVersion/ViaBackwards#900 · Filter by author lowercasebtw opened on Oct 26, 2024
  3