Can't bookmark over page borders

Hi

I'm just getting frustrated about the bookmark experience on Kobo Libra H20 (4.25.x) and hope anyone can guide me to a better experience.

I can bookmark at ease any sentence in a book while I do not go over page boundaries. The specific problems are:

1. invisible marks: whenever I mark a sentence up to the end of a page, the marked part is no longer highlighted as such. Still the pop-up menu confirms that the marking has been done. And the notebook does the same. But why can't I see it?
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2. can't mark into the next page: If a sentence to mark starts on one page and continuous to another I see no easy way to mark the whole sentence. If I start marking to a page end ... I'm used from kindle, that I hit the next page (still in marking mode) and can end wherever I wan't on the next page. But on Kobo? I see no way to reach the next page while marking. I'm just bound to stay on the actual page while marking. ... so the only work-around seems to play with font-size in order to have the whole sentence on one page ... but that's really inconvenient.

3. slow marking: the bookmark feedback in general is really slow and laggy. Did I load to much thirdparties that coud cause performance issues?

Are any of these problem known? Is this the usual behaviour? Is anyone else able to mark over page ends? Any hints that could improve my reading experience? Can it be related to the bookformat (currently I'm sticking to epub files primarily)

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