I know this is a known issue. I am using UUPS proxies. If some other contract sends funds with .send to my proxy contract, it's gonna fail, due to 2300 gas not enough. Since sload got costly, delegatecall is costly and so on. I read OpenZeppelin upgradeable contracts affected by Istanbul hardfork …

There is no solution other than using a custom proxy as you suggest. Generally .send should be avoided and I don't think it's serious nowadays if your contract doesn't support it.

Transfer/Send with proxy

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Transfer/Send with proxy

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