Assume you have the following situation: You are going to create a new multisig wallet with Electrum. 2 signatures are from old hardware wallets and 1 signature is brand new.
The new multisig will only be used with Electrum and Electrum personal server connected to Bitcoin Core. The 2 old signatures from the hardware wallets has been used with the hardware wallets own wallets (like Ledger Live and Trezor Wallet). Then I guess we can assume that the master public keys from those 2 wallets has been uploaded to some server somewhere and could be "leaked".
From a privacy standpoint, if I create a new multisig, is it possible to get any information from the 2 old master public keys? Or, do you need all 3 keys?
Would it be a good practice to create two new master public keys (by "reinstalling" the old hardware wallets) and create a new multisig with 3 brand new keys (and treat them with more care in the future)? Or is it fine, because 1 key is new?