[MR100] Authorize Upgrade to RT4303 on Moonriver via Whitelist

Abstract - This proposal is to authorize the upgrade to runtime 4303 on Moonriver using the whitelist track.

Details - An issue has been identified in the Moonriver & Moonbeam runtimes. The OpenGov Technical Committee has voted in favor of whitelisting the authorization for upgrades to both networks in order to address this issue quickly.

Community members are asked to vote AYE.

More details surrounding the issue will be shared at a later time.

The moonbeam proposal can be found here.

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Moonriver was successfully updated to RT4303 at approximately 14:20 UTC today (May 13, 2026).

The identified issues that were patched related to underestimated PoV on certain pre-compiles which could lead to a chain stall under certain conditions.