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It appears that your prompt character is ~, which is not part of the OOTB prompt characters Discovery is expecting.
[#>%$] (text version)
Try adding ~ to the Prompt. I don't know if it needs to be escaped with a backslash, so try first without
Thanks Bob, very good hint . I would not even search there. But you probably mentioned ":" or "\:". Actually it was not needed to escape it.