I wanted to export a finished document (a book) made with Indesign Version 18.5 (2023) after updating to Version 19 (2024). After exporting I noticed that the word-wrapping was ruined and images on wrong pages because at some points in the document the line breaks were different and it made the paragraph a line longer than before and thus ruining the following textwrap.

If I open the document with the old indesign version, everything is fine. I compared the preferences and everything is identical. In both cases the paragraphs use the single-line-composer and the justification is not changed either.

Is this a bug or a result of different versions? I never really had a problem of wrong line breaks after updating and it's not acceptable when continuously working on multiple projects over the course of months when updating indesign each year is necessary.