I restored my seed and my labels are gone

You restored your seed, saw your funds, but every label you had put on transactions, addresses, or keys vanished: it's not a wallet bug, it's what happens when the seed doesn't carry that data.

Why labels don't come back with the seed

The seed restores the keys that control your bitcoin, and with them the wallet can re-read transactions from the chain. But the labels you put on those transactions, addresses, or keys don't live on-chain: they were stored in the wallet's own file, local to that installation.

BIP-329 says it in its Motivation: “There is, however, no defined standard to transfer any labels the user may have applied to the transactions, addresses, public keys, inputs, outputs, xpubs or spscans in their wallet” (BIP-329, Motivation). There's no defined standard to transfer those labels, so unless you made a specific backup, they're gone.

What you can do now

If you still have the old wallet on another computer or phone, open it and check if it lets you export labels. Some wallets already support BIP-329, which is exactly a format to move them between wallets. If yours doesn't, manually capture the list of labels before you delete anything.

If you already deleted the old wallet and don't have the labels anywhere else, there's no way to get them back from the seed. Recreating them by hand is the only path, and it's worth doing right after you restore so you don't drag around a wallet without context.

Losing labels isn't just a housekeeping problem

Several wallets now require labels before you can spend, so losing them is not just about losing convenience. If your wallet demands a label to release a payment, being without them can leave you with funds in view and no way to use them.

Losing labels isn't just a housekeeping problem

Source: BIP-329, Motivation