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Rainbow Six Siege: Y10S4 Patch Notes Addendum (Dec 2, 2025): what changed
Rainbow Six Siege: Y10S4 Patch Notes Addendum was published on Dec 2, 2025 and includes 27 fixes.
TL;DRThis update is mostly bug fixes. Every change below links back to the official notes.
Who this matters to
All players
This update's changes are listed below exactly as the official notes describe them.
All 27 changes
Gameplay
History · 13 patches →Fix
Fixed: Players can't spectate the closest ally upon being eliminated in Dual Front.
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Fixed - Players can't spectate the closest ally upon being eliminated in Dual Front.
Fix
Fixed: Maestro's Evil Eye can be placed in a hard to reach area in B1 Diving Room on the Kanal map.
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Fixed - Maestro's Evil Eye can be placed in a hard to reach area in B1 Diving Room on the Kanal map.
Fix
Fixed: Attackers can trigger Denari's T.R.I.P connector through walls.
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Fixed - Attackers can trigger Denari's T.R.I.P connector through walls.
Fix
Fixed: AI Operators will attempt to melee gadgets through walls when the gadgets are placed on a door frame during Field Training.
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Fixed - AI Operators will attempt to melee gadgets through walls when the gadgets are placed on a door frame during Field Training.
Fix
Fixed: AI Operators don't react to being pinged during Field Training.
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Fixed - AI Operators don't react to being pinged during Field Training.
Fix
Fixed: Players are unable to pick up the defuser if it's dropped inside a barrel on the Oregon map.
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Fixed - Players are unable to pick up the defuser if it's dropped inside a barrel on the Oregon map.
Fix
Fixed: Azami's Kiba Barriers can provide rooftop access via the hatch at 2F Logistic Office on the Clubhouse map.
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Fixed - Azami's Kiba Barriers can provide rooftop access via the hatch at 2F Logistic Office on the Clubhouse map.
Fix
Fixed: Aruni's Surya Laser Gate detects players from a longer than intended range when deployed on breakable walls.
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Fixed - Aruni's Surya Laser Gate detects players from a longer than intended range when deployed on breakable walls.
Fix
Fixed: Aruni's Surya Laser Gate is able to deal friendly fire and damage to Aruni.
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Fixed - Aruni's Surya Laser Gate is able to deal friendly fire and damage to Aruni.
Fix
Fixed: The PMR90A2 has lower damage drop-off than other Designated Marksman Rifles.
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Fixed - The PMR90A2 has lower damage drop‑off than other Designated Marksman Rifles.
Fix
Fixed: The PMR90A2's hipfire spread decreases when the Player is prone.
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Fixed - The PMR90A2's hipfire spread decreases when the Player is prone.
Fix
Fixed: Swapping between weapons with the accelerated weapon swap causes a short delay in firing.
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Fixed - Swapping between weapons with the accelerated weapon swap causes a short delay in firing.
Level Design
History · 6 patches →Fix
Fixed: Hatches are not pre-destroyed in Deathmatch in Modernized maps.
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Fixed - Hatches are not pre-destroyed in Deathmatch in Modernized maps.
Fix
Fixed: Multiple rappel hooks are missing or misplaces on the Clubhouse map.
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Fixed - Multiple rappel hooks are missing or misplaces on the Clubhouse map.
Fix
Fixed: Multiple rappel hooks are missing or misplaces on the Chalet map.
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Fixed - Multiple rappel hooks are missing or misplaces on the Chalet map.
Fix
Fixed: Multiple rappel hooks are missing or misplaces on the Border map.
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Fixed - Multiple rappel hooks are missing or misplaces on the Border map.
Operators
History · 7 patches →Fix
Fixed: Clash can be headshot through her shield while sprinting on stairs.
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Fixed - Clash can be headshot through her shield while sprinting on stairs.
Fix
Fixed: Rauora can't redeploy a D.O.M. panel on a door after one has been destroyed.
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Fixed - Rauora can't redeploy a D.O.M. panel on a door after one has been destroyed.
Fix
Fixed: Kapkan's Entry Denial Device can be deployed facing the wrong way.
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Fixed - Kapkan's Entry Denial Device can be deployed facing the wrong way.
Fix
Fixed: Dokkaebi can get stuck in the Observation Tool after hacking an opponent's phone.
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Fixed - Dokkaebi can get stuck in the Observation Tool after hacking an opponent's phone.
Fix
Fixed: Maestro's Evil Eye can be spotted through walls while active by the glow of the laser.
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Fixed - Maestro's Evil Eye can be spotted through walls while active by the glow of the laser.
User Experience
History · 14 patches →Fix
Fixed: Frost's Welcome Mat stays stuck on an Operator's leg after being revived by an ally.
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Fixed - Frost's Welcome Mat stays stuck on an Operator's leg after being revived by an ally.
Fix
Fixed: Texture issue on light bulb affected by EMP at B Servers on the Consulate map.
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Fixed - Texture issue on light bulb affected by EMP at B Servers on the Consulate map.
Fix
Fixed: Previously highlighted packs are accessed when quickly browsing the packs in the Locker.
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Fixed - Previously highlighted packs are accessed when quickly browsing the packs in the Locker.
Fix
Fixed: Clearance Level Reward Modal incorrectly shows Operators as owned before unlocking.
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Fixed - Clearance Level Reward Modal incorrectly shows Operators as owned before unlocking.
Fix
Fixed: Operator Guide videos will continue loading when accessed during gameplay.
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Fixed - Operator Guide videos will continue loading when accessed during gameplay.
Fix
Fixed: Solis's SPEC-IO Electro Sensor sound effects can be heard at the beginning of a round.
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Fixed - Solis's SPEC-IO Electro Sensor sound effects can be heard at the beginning of a round.
Related changes in Rainbow Six Siege
Structured by Nerf Radar from the official notes (parsed automatically and reviewed by hand). Backfilled Oct 21, 2026 from the official notes: parser output only (no hand edits); labels follow the numbers or explicit wording, unclear lines are held for review. Source: store.steampowered.com · fetched Oct 21, 2026.