Steps to reproduce:

• add some simple function

void func() {

} 

• check indentation below this function - everything is fine (adding stuff / Ctrl+I works as expected)
• get back inside the function, into the line currently only containing whitespaces (for its indent)
• remove all ws from end to beginning by using backspace until you're back in the predecessor line right after the curly brace
• now use Delete key to bring the closing curly brace one line above, code should now look like

void func() {} 

with the cursor placed between the curly braces

• step out of this by using Cursor-Right / Cursor-Down
• check indentation below the function - everything now has minimum indentation of what would have been inside the curly braces before modifying

Note: Modifying the line of void func().. now (or any line before this line lets the indentation work again correctly also below the function)