app/assets/stylesheets/spree/backend/components/_tabs.scss in solidus_backend-2.4.2 vs app/assets/stylesheets/spree/backend/components/_tabs.scss in solidus_backend-2.5.0.beta1

@@ -62,11 +62,11 @@
   flex-grow: 0;
   flex-shrink: 0;
   position: relative;
 
   .tabs:not(.tabs-overflowed) & {
-    display: none;
+    visibility: hidden;
   }
 
   > a {
     position: relative;
     background: white;
@@ -86,10 +86,12 @@
   &:not(:hover) ul {
     display: none;
   }
 
   ul {
-    @include position(absolute, calc(100% - 1px) 0 null null);
+    position: absolute;
+    top: calc(100% - 1px);
+    right: 0;
     z-index: 1;
   }
 }
 
 .tabs li.in-dropdown {