PDF conversion currently relies on detecting lower-case characters on the initial line. Unfortunately there isn't any library which defines what those lower-case characters are across all languages. ě wasn't in the list of characters, but it will be added for for one of the upcoming releases.
At some point in the future a new pdf engine will come out which uses other types of tests to decide when to unwrap a line, but for now the code is sticking with lowercase characters without punctuation.
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