na wiki se píše: The word lest is always followed by the subjunctive mood, usually in either the present or future tense.
(zdroj: https://en.wiktionary.org/wiki/lest)
ale v Oxfordu není v příkladové větě subjunctive https://www.oxfordlearnersdictionaries.com/…english/lest?…
She was afraid lest she had revealed too much.