Kerning problem: V and W, followed by i ì ä ö ü

[Kybernator]

Describe the bug
There exists a kerning problem in Libertinus serif with ä ö ü i í ô å when preceded by W V Y.

Steps to reproduce
Input the character combinations in an opentype-aware application.

Expected vs. actual behavior
I would expect, even though those letter combinations are difficult, some kind of kerning, but none seems to be applied. V and W, followed by an Umlaut or i, are frequent combinations in German, and the lack of kerning really disturbs the shape of the words.

Additional context
I do not know if the combination with Y is of practical relevance, I just mention it because I stumbled over it.
When experimenting with manual kerning (sadly, not a realistic option for full-text production in my use case), a good result was achieved, with the letters in 32 pt, when applying a negative kerning of between 2 and 3 pt, depending on the individual letter combination.

I am currently in preparation for a publishing project and would love to use Libertinus serif, which is otherwise perfect for the job (among other things, because of IPA range coverage). I have to publish in three languages, one of them German, and I will therefore not be able to use Libertinus in its current shape -- but I have yet to find a usable (and beautiful!) alternative.