This is a very specific question, that I can\'t find any documented evidence to support, but have rather a lot of empirical evidence, although only based on a single phone.<
I had the same issue! You can fix it like that:
border-top-left-radius: 5px; border-top-right-radius: 5px; border-bottom-left-radius: 5px; border-bottom-right-radius: 5px;
PS. I hate such updates