Thanks for emailing me your database.
This will be fixed in version 2.1.8.
Unity 2019 uses a new editor GUI system. It computes the width of the hover text differently, which results in floating point imprecision that ends up making the hover text box slightly less than one pixel too narrow. This can cause the last word to be wrapped to the next line, but since the box is only one line high the last word isn't visible.
Can I increase the width of nodes?
Re: Can I increase the width of nodes?
Ah, thanks for explaining that to me. Makes sense.