Sorry, but this is NOT a result of open-save conversion cycles.
The file I sent here never went to word format. It’s simply the default custom template with the styles used to create a brand new document where I only wrote these lines of text and applied these styles on them. After that I only saved it to odt. never to word.
Also I don’t use the word format to supply files to clients, I never have to send word files to clients. I need the word format because on my main system I do use Word and I need the word format, because in LibreOffice it’s still not possible to use soft shadows around images. The shadow that LibreOffice uses is super ugly and simply unusable. If LibreOffice will have a good looking soft shadow around images I’ll move to LibreOffice completely directly, but it doesn’t seem to even be in their future plans as it’s lacking for years now.
Switching over to do everything to odt, including in Word itself, is not an option, because I have a few thousand files in use and I don’t want to convert all these. And rather keep using the docx format.
Which, again, always worked fine with the exact same software (the same libre office and the same custom template), until yesterday.
The only thing I could think of that could’ve messed this up is when libreoffice is using some windows- or microsoft-provided thing to make the conversion from its format to or from word format. SOmething that is updated by the windows updates and is not prorietory to/built into libreoffice. That’s the only thing I could think of right now.
I also don’t know what you mean with ’ heading 1-2 are detached from the built-in engine’. I’m in no way an expert on LibreOffice, but looking to it with a developer-view I would think it’s still using the exact same style references, only the styles are messed up. Because when I copy the contents and paste it into a new file, which is using the exact same custom template as base, everything looks fine again. Meaning that the styles are used from the template, otherwise they should look as bad I would think.
Thanks for trying to help. I’ll file a bug.
BTW Why are comments losing their format (paragraphs etc.) on this forum. They look alright in the preview. What’s the point of having a preview if it looks different on output?! Weird