feedback6 R21B: 联防 plays on the round's battlefield again — its terrain, crates, water, devices and runes, as in 0.1.4 (the owner's decision of 2026-10-07, 「官服保留地形，改回去」; GitHub #244). 0.2.0's escaped-level map (8a436249, §25.6.4) is withdrawn: that map is the placeholder grid all 39 wave template levels carry, tile for tile; only the 11 stage levels have terrain. match/unitePhase.js _uniteOpts fields this.stageId in both combat modes, unite.js uniteStageId is removed, the client draws the 联防 on the board's stage again (screens/game.js: 0.1.4's ownStage / baseStage, no map switch, nothing to restore on leaving), the dev mock likewise. Kept from 0.2.0: own-board 突袭 / 乌尔比安 S3 landings (onOwnBoard, raidTile untouched), the bounty payee, the 联防 BGM, the SETTLE result box. data/stages.json keeps the two kind 'unite' records (no field uses them; engine tests use them as a plain two-halves road); tools/build-data.mjs comments only, an offline rebuild reproduces data/ byte for byte. The 联防 battle input is byte-identical to v0.1.4's in 20 cases (5 stages × 1 / 2 helpers × both combat modes); GitHub #41 item 3 (野鬃 pushing walkers back across the gate onto the other half) is back with v0.1.4's numbers, none off the map. Tests: test/match/feedback5-unite-map.test.js rewritten (6, all fail on the parent), test/e2e/coop.e2e.mjs checks the 联防 field's drawn stage; docs: DATA §12, META §4, PLAYING §5, design/geometry-time, I18N, the §25.6.4 pointer; golden: fields unite-1 (escaped_single → act1autochess_m02) and unite-2 (escaped_multi → act1autochess_m07), the stages of 0.1.4, and the co-op matches whose 联防 rounds come out differently on the round's map — coop2-NORMAL-3, coop2-HARD-4, coop3-ABYSS-5, coop4-ABYSS-7, coop2-NORMAL-8-serverrun, coop2-NORMAL-14-standins (now a victory)

public/js/screens/game.js

@@ -356,20 +356,19 @@ function MatchScreen() {
   const shownMembers = shownField ? ((Array.isArray(pub?.fields) ? pub.fields : []).find((f) => f && f.fieldId === shownField.fieldId)?.players
     || (Array.isArray(shownField.players) ? shownField.players : null)) : null;
   const ownView = showPrep || (shownField ? (shownMembers ? shownMembers.includes(myId) : shownField.fieldId === ownFieldId(myId)) : !watchingOther);
-  // a field on a map of its own (联防: the escaped template's map, GitHub #41) shows that map; leaving it restores the board's
-  const fieldStage = gd.ready && shownField && shownField.stageId && shownField.stageId !== pub?.stageId ? gd.stage(shownField.stageId) : null;
+  // every field is fought on the round's battlefield — 联防 too, its terrain, crates and water included (0.2.1, the
+  // owner's decision of 2026-10-07; 0.2.0 drew the escaped levels' empty road there and restored the board on leaving)
   useEffect(() => {
     if (!view) return;
-    const st = fieldStage || (ownView ? ownStage : baseStage);
+    const st = ownView ? ownStage : baseStage;
     if (st) view.setStage(st);
-  }, [view, ownView, ownStage, baseStage, fieldStage]);
-  // the stage behind the board ON SCREEN — the one view.setStage was just given: a field's own map (联防, GitHub #41),
-  // else the own one (机变 overrides applied) or, while watching a teammate, the plain one — and how a tapped BOARD tile
-  // maps to it (GitHub issue #184: tileClick → gameLogic.terrainInfo). Everywhere but a boss-prep board the two spaces
-  // are the same: a 最终攻势 / 隐秘核心 battle renders the stage's own rows (GEO.BOSS_RECT), 联防 / normal rects are
-  // stage rows; the boss PREP draws the player's half (stage rows 2–5) as board rows 9–12 (render/prepfield.js toDisp),
-  // which is exactly gameLogic.fieldTile.
-  live.current.terrainStage = fieldStage || (ownView ? ownStage : baseStage);
+  }, [view, ownView, ownStage, baseStage]);
+  // the stage behind the board ON SCREEN — the own one (机变 overrides applied) or, while watching a teammate, the plain
+  // one — and how a tapped BOARD tile maps to it (GitHub issue #184: tileClick → gameLogic.terrainInfo). Everywhere but a
+  // boss-prep board the two spaces are the same: a 最终攻势 / 隐秘核心 battle renders the stage's own rows (GEO.BOSS_RECT),
+  // 联防 / normal rects are stage rows; the boss PREP draws the player's half (stage rows 2–5) as board rows 9–12
+  // (render/prepfield.js toDisp), which is exactly gameLogic.fieldTile.
+  live.current.terrainStage = ownView ? ownStage : baseStage;
   live.current.terrainTile = showPrep && (deployField === 'bossL' || deployField === 'bossR')
     ? (row, col) => fieldTile(deployField, row, col)
     : (row, col) => [row, col];