When I mark a sentence (or a part of a sentence) that starts with a number and change case, the number gets unmarked.
500 translators are swearing.
becomes (when changing the case)
500 TRANSLATORS ARE SWEARING.
The toggle function works without any problem, but this effect is highly irritating.
Indeed, but it remains irritating for anyone who did not expect this. And it does neither work with any number at the end nor (clearly enough) any number in the middle.