Sorry for late reply, holidays..
If you only used lnd for onchain payments and never opened any channels, that would explain a lot. It is not uncommon for SCB restoration to only “highlight“ utxos related to channel opening and closing, but the funds are still safely there.. Just follow my post from other thread. It will recover all your funds.. Seed phrase does not recover all on chain funds - #11 by babik
Edit: I have read / realised the link might be confusing and incomplete. Tldr.. Either you can rescan your LND’s wallet, or import your wallet to sparrow via bip32 root key. In that case you import segwit and taproot address paths as two separate wallets bc sparrow is unable to treat them as a single one..