[Bug] TUI shell output truncated at bottom with no scroll support during background execution

Bug Description
when the background shell is running, and when i am trying to see the content in it in TUI in claude code. i am not able to see the bottom most part. it is getting chopped and unable to scroll.

Environment Info

• Platform: darwin
• Terminal: ghostty
• Version: 2.1.118
• Feedback ID: 5eda5fd0-b251-4c17-b7ff-59677d087bf4

Errors

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/manikantagonugondla/.local/share/claude/versions/2.1.118 (expected in multi-process scenarios)\n    at ai_ (/$bunfs/root/src/entrypoints/cli.js:2756:2177)\n    at IK8 (/$bunfs/root/src/entrypoints/cli.js:2756:1257)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-23T21:06:04.795Z"}]