The answer
Yes. BIP39 normalises mnemonic and passphrase text to Unicode NFKD before seed derivation, but an extra character not removed by normalisation can change the derived seed entirely.
What to do next
Compare the exact original passphrase using trusted on-device entry or approved recovery software, paying attention to spaces and copied characters.
BIP39 reference specification
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Trezor hardware wallet
Related self-custody hardware; verify supported coins, networks and recovery standards. It cannot reverse an already compromised seed or fraudulent transfer.
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Frequently asked questions
Does capitalisation matter for a BIP39 passphrase?
Yes. Different capitalisation normally changes the derived seed; the word list and passphrase are not interchangeable.