investigate gogo Clone() method issue

seems to be some panic happening with upgrades from v50-v53 where gogoproto's Clone() is no longer working. `panic: merger not found for type:big.Word` ref: [https://cosmoslabsio.slack.com/archives/C047X1T6ERK/p1769801516848499](<https://cosmoslabsio.slack.com/archives/C047X1T6ERK/p1769801516848499>)