Desktop app: all emoji in assistant chat output render as blank gaps

Description

In the Claude Code desktop app, emoji in assistant messages render as blank horizontal gaps instead of glyphs — surrounding text is intact, but every emoji is missing, leaving whitespace roughly the width of the characters.

Correction from the original report: this is NOT limited to consecutive emoji sequences. The user confirms that across an entire long session, no emoji rendered at all — single emoji (🎉), pairs (🏡✨), and three-emoji runs (🐾✨🌙) were all blank.

Environment

• Claude Code 2.1.141 (desktop app UI, proportional font rendering)
• macOS (Darwin 25.5.0, Apple Silicon)

Reproduction

1. Have the assistant produce any message containing emoji inline in a sentence, e.g.: her sign-off = 🐾✨🌙, the rest of the sentence or best day of my life 🏡✨
2. View the message in the desktop app transcript.

Expected

Emoji render inline.

Actual

Blank gaps where every emoji should be (confirmed via user screenshot: her sign-off = [ ], the rest…; text before/after renders normally). User reports zero emoji rendered anywhere in the session's chat transcript.

Notes

• The same emoji written by the assistant into markdown FILES are intact when those files are opened elsewhere, so the content is correct — this is a transcript-rendering issue in the app.
• Affected code points observed include U+1F43E, U+2728, U+1F319, U+1F389, U+1F3E1 — i.e., not code-point-specific.