Bug: Cannot create groups with more than 49 users on staging

[api-Hypernova]

Describe the bug

xmtp_mls::groups::mls_sync Sync: error publishing intents WrappedApi(Api(ClientWithEndpoint { endpoint: "/xmtp.xmtpv4.payer_api.PayerApi/PublishClientEnvelopes", source: Status(Status { code: Internal, message: "internal server error", metadata: MetadataMap { headers: {"date": "Thu, 11 Sep 2025 11:19:06 GMT", "content-type": "application/grpc", "content-length": "0"} }, source: None }) }))

Expected behavior

We should be able to create groups with up to 250 identities.

Steps to reproduce the bug

XDBG repro (will fail every time): RUST_LOG=xmtp_api_grpc=debug,xmtp_mls=debug,xmtp_proto=info cargo xdbg -d -b staging generate --entity group --amount 1 --concurrency 1 --invite 49 49 users will work every time: RUST_LOG=xmtp_api_grpc=debug,xmtp_mls=debug,xmtp_proto=info cargo xdbg -d -b staging generate --entity group --amount 1 --concurrency 1 --invite 48