Worst case shim it.
That's a normal and necessary amount of clearance.
You could try a 15/16" wrench (15/16" = 23.81mm) but honestly when you're down to fretting about tenths of a mm, you're way past the point of normal manufacturing variations.

I notice with the larger sizes the "play" between fastener and tool is larger. I wouldnt worry about that..
24mm fuel line!? What are you working on?
Would my Channelock metric adjustable be of assistance?
It has the ability to get close tolerances ?
