Styles include mandatory language setting (in edit style-font-language) and when a style is applied to text it overwrites language information with own setting which is a huge inconvenience especially if this text is multilingual. I'd like to have [undefined] setting for style, which applies formatting but leaves language information of the original text intact, ditto for character (font-character). Setting style language to [none] is not it, it removes language completely. Come to think of it, linking formatting and language is not a good idea, they should be independent, and there is already a bug for that: https://bugs.documentfoundation.org/show_bug.cgi?id=151290 but maybe the workaround I suggest will be easier to implement?
I believe this is an issue in which workarounds are inappropriate. This is too fundamental of an issue to plaster over; and we would be stuck with rolling back such "plastering", and remembering it existed, in years to come. So, suggest marking this as a dupe of bug 151290. I realize that also means we'll be waiting a long time for it to be resolved...