I'd say you should focus on getting the right derivation path first, then wallet file recovery as a last resort.

What was the electrum version bundled with Tails before you updated to version 3.3.8? Since you mentioned that the seed restores the wallet fine on the old version, but it restores to a different wallet on this newer version, it is possible that Electrum has changed the default derivation path or otherwise the algorithm it uses to derive the private keys, hence why knowing the old electrum version (or at least the Tails version you used and we use package manager repositories to pinpoint the Electrum version ourselves) is so important, as it will allow us to scan for code changes on Github related to key derivation.