If I try to create a rule to validate the content of one single cell or a range of them with the option: Data - Validity (sorry if is not the exact translation, my language is spanish), no matter the option I choose (All, text, number, list and so on), sheets hangs out after pressing the button Accept.
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In Calligra Sheets 3.2.1 in Slackware 15.0 the same error persists, without any change.
Cannot reproduce this in the git version, assuming fixed.