The Float and Double constructors were deprecated in Java 9. Some of the 'mature'/previously-generated selector code is still using these. The methods remain currently but have additionally been marked as for-removal in Java 16, meaning they are intended for actual removal and could actually go away in 17+. The valueOf methods should be used instead.
(This isn't visible during build normally while the javac -release flag is being set, but having disabled it to test something else the compiler then emitted a warning once using the Java16 signatures even though continuing to target 8)