/ slash-command autocomplete: Down arrow past a large same-prefix block (gortex-*) causes unbounded re-loading

Bug description

In the / slash-command autocomplete dropdown, navigating with the Down arrow key past the currently visible window causes the list to keep growing indefinitely — the scrollbar never reaches a bottom, and the same block of ~21 gortex-* entries (installed by a third-party code-intelligence tool, each registered as an individual command .md, skill SKILL.md, and agent .md directly under ~/.claude/) reappears over and over.

Key reproduction detail: does not happen when filtering by typing (/gortex renders correctly once). Only happens navigating the full unfiltered / list with Down arrow past that block.

Comparison data point: a plugin (superpowers, 15+ skills, namespaced as superpowers:name and grouped under its own plugin manifest) does not reproduce this, nor do a dozen other individually-installed personal skills under the same ~/.claude/skills/ directory (blinter-validation, changelog-generator, graphify, etc.) — none of those share a long run of identically-prefixed consecutive entries. The gortex-* group is the only ~21-entry run sharing a literal common prefix (gortex-) in the flat list. This suggests the bug is specifically triggered by a large consecutive run of same-prefix entries in the unfiltered list, not by the tool's packaging method (plugin vs. loose files) in general.

Steps to reproduce

1. Have ~20+ commands/skills installed sharing an identical literal name prefix (not plugin-namespaced), directly under ~/.claude/commands/ and/or ~/.claude/skills/.
2. Type / alone (no filter).
3. Press Down arrow repeatedly to scroll through the full list.
4. Observe: past that prefix block, the scrollbar keeps growing and the same entries re-appear instead of the list terminating.

What was ruled out

• Not caused by registering the same name across agents//commands//skills/ simultaneously: removing, then separately renaming, one of the three registries for a test entry had no consistent effect — both changes reverted.
• Not a typing-filter issue — filtering by typing renders correctly.

Environment: Claude Code v2.1.296, Windows 11, Sonnet 5.

Expected behavior: Down-arrow navigation through / autocomplete should terminate at the end of the actual command/skill list, regardless of how many entries share a common prefix or how they were installed.