Chainlink suggests to have a unique requestId for every separate randomness request. By always using the same value, its not possible to tell whether Chainlink returned data for a valid request, or if there was some Chainlink bug that triggered a callback for a request that was never made
There is 1 instance of this issue:
https://github.com/code-423n4/2022-09-artgobblers/blob/d2087c5a8a6a4f1b9784520e7fe75afa3a9cbdbe/src/utils/rand/ChainlinkV1RandProvider.sol#L62-L66
