On trust wallet, sometimes if you update your wallet or even import your wallet in another device, some of the transaction history might not appear visible on the app. I have experienced this before while using trust wallet.

The transaction history is always available on the blockchain since everything is transparent. Why are you even worried about this?

Just enter your coin address to a respective block explorer, and you will be able to see everything. Trustwallet is just a wallet software for user interface but everything else is recorded on the blockchain.

If you restore it using wallet seed, all previous transactions will appear, but some settings will disappear, such as some of the tokens you hid or comments you left.
If you don’t remember wallet seed, all your coins will be lost.

I didn’t really pay attention to the TrustWallet mechanism, even though I repeatedly installed and reinstalled it, but AFAIK they will restore your transaction data via Blockchain.