We ran into the same thing on our build.

On the attachment of the strut to the fuselage, relieve the top tab just enough to make a good fit without touching. Using washers to get a good fit is a good practice.

As you work through the build you will find callouts for the standard washer only to find when the nut is tightened there are enough thread showing. Just switch the washer to a "Light" washer.

Ralph