Hi petaramesh,
Since this thread was the first time ever posting here; I just want to hint into using the flags, perhaps you have set vivaldi with vivaldi://flags before to use wayland and you did not do that for chromium for whatever reason.
After launching vivaldi with the flag posted multiple times before, It started working for me again, and I was able to undo the vivaldi://flag setting. It might just be, that this option persisted the update to your browser and prevents you now from launching it without specific command line overrides.