Running on Windows 7 x64 with my 19.0.0 config updated from 18.0.1 config (not beta1). My brace style is Next Line Indented, and Auto-Complete syntax expansion is set to NOT automatically insert braces.
If I enter an 'if' statement (for example), type in the if-condition, then press Ctrl-Enter (nosplit-insert-line), the cursor is properly placed on the next line and indented from the if. Then I type an open brace '{', and the open and close brace are inserted in the same column as the if statement, not indented. The same happens for a few other statements that I've tried.
I don't use adaptive formatting, and this happens even in an empty file (with just a main() function and its open/close brace).
(Note: changed subject to reflect this problem is back in RC3/4)