In the text installer given passwords use US layout. After this keyboard's layout changes to the chosen one (fi-latin in my case) and password differs if special characters are used like "=?^_dve.,<>|" etc.
Not quite sure that I understand what you are reporting here. Are you saying that you complete the installer with a US keyboard, and then after completing the install, you switch to a different keymap and then you are not able to type the passwords because they contain special characters?
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