Messages disappear from terminal display during conversation after v2.1.89 update #41814

Description

After updating to v2.1.89, user messages and Claude responses are being removed from the terminal display during a conversation. This did not happen on the previous version (v2.1.87).

Behavior

• During a conversation, previous user prompts and assistant responses disappear from the terminal — not just tool results, but the actual messages themselves
• Scrolling up does not recover them — they are completely gone from terminal output
• Seems to trigger when performing work tasks (file reads, code changes), not during casual chat
• Tool results are also collapsed with (ctrl+o to expand)
• Context usage shows only 6% (59.5k/1M) at the time of occurrence, so this is not autocompact

Expected Behavior

Previous messages should remain visible in terminal scrollback, as they did in v2.1.87 and earlier versions.

Environment

• Claude Code version: 2.1.89
• Model: Opus 4.6 (1M context)
• OS: macOS (Darwin 25.3.0)
• Shell: zsh
• Effort level: high
• Plugins: 21 enabled (everything-claude-code, superpowers, vercel, context7, github, etc.)

Steps to Reproduce

1. Start a new Claude Code session on v2.1.89
2. Have a conversation with some tool usage (file reads, code exploration)
3. After several exchanges, notice that earlier user messages and Claude responses are no longer visible in terminal
4. /context confirms low usage (~6%), ruling out autocompact

Additional Notes

• Disabling /buddy (companion) did not fix the issue
• This is a display/rendering change, not a context issue — Claude still remembers the conversation internally
• This behavior change is not documented in the v2.1.89 release notes
• Could be related to server-side Microcompact threshold changes (GrowthBook feature flags)
• The issue started immediately after updating from v2.1.87 to v2.1.89 on 2026-04-01