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> but I read of a bug in the past about losing funds on using a legacy account
would be helpful if you could find out details.
Far as I’m aware, there was never any „bug about losing funds“. The funds may be inaccessible without a Trezor though. Other than that, the Legacy account will work just fine for everything.
> Can I have any type of problem using this ADA legacy account for anything ( for example staking or If need to restore my seed in a new Trezor model T )?
Not if you’re always restoring on a Trezor. If you restore to a Ledger, or to Daedalus hot wallet, you won’t see the funds most likely.
> Any Pro / Cons on leaving my ADA in the legacy account instead of the normal ADA Suite account? I know I don’t have the freedom the choose the pool for stacking.
The normal account is compatible with Daedalus and other hot wallets, in case you ever need to restore to a hot wallet without a Trezor. Other than that, it’s the same.
> (I used the CLI process to instantiate it with 24 words seed)
You’re just making your life difficult for yourself for no reason. In real life there is no security difference between 12 and 24 words — and as it happens, with a 12-word seed the „legacy“ and „normal“ ADA accounts are the same thing, so you wouldn’t be facing this issue.