incorrect rendering

[vuvova]

This works:

LL=100;
W=38;
module nut() {
  module twosides() { square([LL,W], center=true); }
  intersection() {
    twosides();
    rotate([0,0, 60]) twosides();
    rotate([0,0,120]) twosides();
  }
}
linear_extrude(4)
difference() {
  circle(d=60);
  nut();
  translate([0, LL/2+W/2-0.0001]) square([LL,LL], center=true);
}

but if you remove -0.0001 the object is rendered incorrectly, solid, without a hole

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[t-paul]

This is a caching issue, I'm almost sure we have an issue for that somewhere. It works with just F6 (or Design->Flush Caches + F6).

[vuvova]

It doesn't seem to work with just F6 (just = directly after opening the file) or with Design->Flush Caches. At least not with the version 2019.05.

[Scopeuk]

This appears to come in during the 2d operation.
preview appears to show the shape is incorrectlt derived in two dimensions, possibly due to the 0 width edge closing the shape (someone with more knowledge of the pipeline may be able to help here).
substituting the -0.0001 for a +0.001 also produces a valid shape unfilled which then exports.
-0.0001 (2D)

0 (2D)

+0.001

additionally adding a union causes this to behave as expected

LL=100;
W=38;
module nut() {
  module twosides() { square([LL,W], center=true); }
  intersection() {
    twosides();
    rotate([0,0, 60]) twosides();
    rotate([0,0,120]) twosides();
  }
}
linear_extrude(4)
difference() {
  circle(d=60);
  union(){
    nut();
    translate([0, LL/2+W/2]) square([LL,LL], center=true);
  }
}

[kintel]

Status as of 2024-03-24: Works now!