diff --git a/docs/ISSUES.md b/docs/ISSUES.md
index 5de3df89..2a7cfe43 100644
--- a/docs/ISSUES.md
+++ b/docs/ISSUES.md
@@ -24,6 +24,46 @@ What does NOT go here:
 - Every session: scan OPEN issues at start; promote/close anything we touched during the session before ending.
 - Promoting to a Phase: mark as `DONE (promoted to Phase X)` + commit SHA where the Phase entry landed.
 
+## #338 — The player resolves with stepUp/stepDown 0.400 where Setup 0x02000001 authors 0.600 / 1.500
+
+**Status:** OPEN
+**Severity:** unknown until measured, plausibly medium. A 1.5 m step-down is
+what keeps a mover attached to a descending slope; 0.4 m is not, so this is a
+candidate contributor to descent/edge feel — but that link is NOT established
+and must not be assumed.
+**Filed:** 2026-08-06, spotted in the #337 `[support]` capture while chasing a
+different defect. Deliberately not chased there: it does not cause the Neftet
+wedge, and folding it in would have made that fix unfalsifiable.
+**Component:** physics / movement.
+
+### The observation
+
+The human Setup `0x02000001` authors `StepUpHeight = 0.600` and
+`StepDownHeight = 1.500`. The live `[support]` probe lines show the player
+resolving with `stepUp=0.400 stepDown=0.400`.
+
+### What is NOT yet established
+
+- Whether the authored Setup values are what retail feeds `CPhysicsObj`, or
+  whether retail also substitutes constants at this seam. **Grep
+  `named-retail` for `get_stepup_height` / `get_stepdown_height` and their
+  callers before touching anything** — the authored DAT field being ignored is
+  only a defect if retail reads it.
+- Where the 0.400 comes from: a hardcoded default, a stance/posture-dependent
+  value, or a value that never got wired from the Setup.
+- Whether it has any observable consequence. Do not open this by reasoning
+  from the source; the #337 lineage already burned two diagnoses that way.
+
+### Related
+
+Sits next to #32 (local-player cliff edge-slide), which has its own research
+at `38db9fff` and needs a live `ACDREAM_DUMP_EDGE_SLIDE=1` capture before a
+fix. If both turn out to touch descent feel, do NOT bundle them — they have
+different mechanisms and need separate gates.
+
+---
+
+
 ## #337 — Neftet rock plateaus: wedged at the top, jumps sink into the mesh, corpses fall through — FIXED, awaiting live acceptance
 
 **Status:** FIXED 2026-08-06 by #333's fix — the query-site broadphase reach
diff --git a/docs/research/2026-08-06-337-neftet-wedge-mechanism.md b/docs/research/2026-08-06-337-neftet-wedge-mechanism.md
index c32b3747..404a7e3c 100644
--- a/docs/research/2026-08-06-337-neftet-wedge-mechanism.md
+++ b/docs/research/2026-08-06-337-neftet-wedge-mechanism.md
@@ -270,7 +270,7 @@ Dropping the columns would make the two captures incomparable.
 
 ---
 
-## Separate observation, not part of this defect
+## Separate observation, not part of this defect — now filed as #338
 
 Setup `0x02000001` authors `StepUpHeight = 0.600` and
 `StepDownHeight = 1.500`. The live `[support]` lines show the player resolving