_button-group.scss in bootstrap-5.2.0

- old
+ new

@@ -32,17 +32,20 @@
     width: auto;
   }
 }
 
 .btn-group {
+  @include border-radius($btn-border-radius);
+
   // Prevent double borders when buttons are next to each other
   > .btn:not(:first-child),
   > .btn-group:not(:first-child) {
     margin-left: -$btn-border-width;
   }
 
   // Reset rounded corners
   > .btn:not(:last-child):not(.dropdown-toggle),
+  > .btn.dropdown-toggle-split:first-child,
   > .btn-group:not(:last-child) > .btn {
     @include border-end-radius(0);
   }
 
   // The left radius should be 0 if the button is: