Retool change history: React App Builder Sandbox Installs May Fail to Install Dependencies

Retool reported a major React App Builder incident: downstream dependency issues could prevent sandbox installation and connection on Cloud and Self-Hosted instances. It ran from 2026-08-20 17:26 UTC to 2026-08-20 23:20 UTC (5 h 54 min); Cloud recovered at 17:30 UTC, and self-hosted fixes shipped in 4.0.12-stable and 4.43.0-edge.