Wow, thanks! Very complete.
"While great advances have been made in interoperability and recoverability, developers across the industry continue to build wallets that either:
  • Don’t implement BIP standard(s).
  • Implement a BIP standard, but inconsistently when compared with other wallets.
  • Implement a BIP standard, but one that has not been widely adopted (and perhaps only by them).
  • Don’t have clear documentation about their derivation paths, backup and recovery processes."
That is exactly it. And what I've been explaining my friend.
I'll dig through it and especially in the derivation path, as I'm pretty sure that's the issue. Besides it's the one I most heard about in similar cases.
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