I appreciate the thorough look into this. Yes, sparrow can load the watch-only wallet just fine, the coins are there. It prompts for a hardware wallet for signing, but since mine is on electrum (tails usb) I don't think this is an option. Cant spend from here. I also attempted loading in the bip32 extended private key as per your instructions. It allowed me to apply this, but none of the addresses are the same as the watch only, and none of the utxos are there.
Is your seed even a BIP39 seed? If you generated it using Electrum it is most likely is an Electrum seed. When you restore your wallet in Electrum you probably go through "Standard wallet" -> "I already have a seed". When entering the seed, do you change anything in the "Options" or do you leave it on the default "Electrum" seed type.
And on a different note: You do not actually have to patch Sparrow wallet. Under "File" -> "Preferences" -> "General" -> Turn off "Validate derivations"
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If you have a simple Electrum wallet file then it actually makes things pretty easy.
  1. In Sparrow Wallet go to "File" -> "Import Wallet..."
  2. Next to "Electrum" click "Import File..."
  3. Locate the Electrum wallet file (usually in ~/.electrum/wallets/)
  4. You are asked to name the wallet. Click "Create Wallet".
  5. Optionally set a password
  6. Now you have imported the wallet and your SegWit Coins should appear.
  7. Switch to the "Settings" tab
  8. Change "Script Type" to "Taproot (P2TR)"
  9. When asked whether to clear the keystores, select "No"
  10. Click "Apply"
  11. Now you should see your "lost" Taproot coins, ready to be spent.
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You're a gem Filiprogrammer. I don't know how many hours it would have taken me to figure that out. Bitcoin is breaking out of 70k just for you!
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Thanks for the big zap! Glad I could help
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