Change in bash tab completion behaviour

Suppose I have a directory '/foo/'. If I type 'cd /foo[TAB]', it correctly completes to 'cd /foo/'. If I type 'ls /foo[TAB]', it completes to 'ls /foo ' with a space after it. This is different from before; I am used to all commands behaving the first way. I prefer this way because if there is a subdirectory, it is easy to switch to it. The second way has it so that I have to backspace and add the trailing slash manually before I can start typing the name of the subdirectory. This is something that has started happening recently with bash completion. Does anyone know what's going on?