collect vectors to workaround vcat issue

src/examples.jl

@@ -1271,7 +1271,7 @@ _animation_examples = [2, 31]
 _backend_skips = Dict(
     :gr => [25, 30],
     :pyplot => [2, 25, 30, 31, 49, 55, 56],
-    :plotlyjs => [2, 21, 24, 25, 30, 31, 49, 51, 55, 56],
+    :plotlyjs => [2, 21, 24, 25, 30, 31, 49, 50, 51, 55, 56],
     :pgfplotsx => [
         2,  # animation
         6,  # images

src/utils.jl

@@ -432,9 +432,9 @@ end
 
 #turn tuple of fillranges to one path
 function concatenate_fillrange(x, y::Tuple)
-    rib1, rib2 = first(y), last(y)
-    yline = vcat(rib1, (rib2)[end:-1:1])
-    xline = vcat(x, x[end:-1:1])
+    rib1, rib2 = collect(first(y)), collect(last(y)) # collect needed until https://github.com/JuliaLang/julia/pull/37629 is merged
+    yline = vcat(rib1, reverse(rib2))
+    xline = vcat(x, reverse(x))
     return xline, yline
 end