Formatting is removing the space between "return" keyword and constants

Hi!

I've recently customized my code style settings, and must have messed with the wrong setting, but I can't identify which it might be.

When I run code cleanup or when I aut-format code, lines similar to this:

return 0f;

Get changed into:

return0f;

Which results in compile errors. 

Does someone know what setting is relevant for this?
I'm using rider for Unity and C# excusively, so it's only settings relevant to those contexts.