Text prediction cache
BE SURE clear your text prediction cache for not loosing private key!
Predictive typing remembers your used words and will suggest the second word as soon as you type the first one, especially if it's a word you not commonly use.
When you type the first words, the keyboard can autofill the rest. Moreover, keyboards from Samsung and Microsoft do it as accurately as possible, while GBoard from Google doesn't.
This makes it easy to attack, if scammers get your hands on a phone, they start any chat app, and start typing any words off the BIP39 list, and see what the phone suggests.
All you have to do is clear your text prediction cache:

Guide for Android

How to Clear Samsung Keyboard History or Cache (S9, S10, Note 9 & etc)
IntoPut

Guide for Iphone

How to remove words from iPhone predictive text
Macworld
Don't think about it — just protect your keys yourself!
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