Polygon Foundation (@0xPolygonFdn): On September 10, 2025, at 04:30 UTC, the Polygon network experienced a degradation in its milestone finalization mechanism.

On September 10, 2025, at 04:30 UTC, the Polygon network experienced a degradation in its milestone finalization mechanism. A rare race condition between milestone processing and block importing caused an incompatible milestone to be recorded in some validator nodes, leading to extended delays in milestone based finality. While blocks continued to be finalised via checkpoints, providing finality in around 20 minutes, a hard fork based fix was required to remediate the incorrect milestone, and restore usual milestone based finality (4 - 5 seconds). The network resumed normal operation following this hard fork at 15:00. Following a detailed post-mortem, the development team have released a new version of bor as an additional safety guards to prevent any reoccurrence. We advise upgrading to v2.2.11 to ensure continued compatibility and performance, detailed here: https://t.co/JE2YUpRAb6