diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 737e7ee3..26ff2678 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -6,7 +6,8 @@ on:
   push:
     branches:
       - main
-    tags: '*'
+    tags:
+      - '*'
   workflow_dispatch:
 jobs:
   test:
@@ -19,12 +20,12 @@ jobs:
         version:
           - '1.10'
           - 'nightly'
-        os:
+        os: # FIXME - windows-latest
           - ubuntu-latest
           - macOS-latest
-          # FIXME - windows-latest
         arch:
           - x64
+        allow_failure: [false]
         include:
           - version: 'nightly'
             allow_failure: true
diff --git a/test/stage2_fwd.jl b/test/stage2_fwd.jl
index 6bc48d08..34ae734d 100644
--- a/test/stage2_fwd.jl
+++ b/test/stage2_fwd.jl
@@ -6,8 +6,7 @@ module stage2_fwd
         @test sin′(1.0) == cos(1.0)
     end
     let sin′′ = Diffractor.dontuse_nth_order_forward_stage2(Tuple{typeof(mysin), Float64}, 2)
-        # This broke some time between 1.10 and 1.11-DEV.10001
-        @test isa(sin′′, Core.OpaqueClosure{Tuple{Float64}, Float64}) broken=VERSION>=v"1.11-"
+        @test isa(sin′′, Core.OpaqueClosure{Tuple{Float64}, Float64})
         @test sin′′(1.0) == -sin(1.0)
     end
 
@@ -15,27 +14,26 @@ module stage2_fwd
     self_minus(a) = myminus(a, a)
     ChainRulesCore.@scalar_rule myminus(x, y) (true, -1)
     let self_minus′ = Diffractor.dontuse_nth_order_forward_stage2(Tuple{typeof(self_minus), Float64})
-        # This broke some time between 1.10 and 1.11-DEV.10001
-        @test isa(self_minus′, Core.OpaqueClosure{Tuple{Float64}, Float64}) broken=VERSION>=v"1.11-"
+        @test isa(self_minus′, Core.OpaqueClosure{Tuple{Float64}, Float64})
         @test self_minus′(1.0) == 0.
     end
     ChainRulesCore.@scalar_rule myminus(x, y) (true, true) # frule for `x - y`
     let self_minus′ = Diffractor.dontuse_nth_order_forward_stage2(Tuple{typeof(self_minus), Float64})
         # This broke some time between 1.10 and 1.11-DEV.10001
-        @test isa(self_minus′, Core.OpaqueClosure{Tuple{Float64}, Float64}) broken=VERSION>=v"1.11-"
+        @test isa(self_minus′, Core.OpaqueClosure{Tuple{Float64}, Float64})
         @test self_minus′(1.0) == 2.
     end
 
     myminus2(a, b) = a - b
     self_minus2(a) = myminus2(a, a)
     let self_minus2′ = Diffractor.dontuse_nth_order_forward_stage2(Tuple{typeof(self_minus2), Float64})
-        @test isa(self_minus2′, Core.OpaqueClosure{Tuple{Float64}, Float64}) broken=VERSION>=v"1.11-"
+        @test isa(self_minus2′, Core.OpaqueClosure{Tuple{Float64}, Float64}
         @test self_minus2′(1.0) == 0.
     end
     ChainRulesCore.@scalar_rule myminus2(x, y) (true, true) # frule for `x - y`
     let self_minus2′ = Diffractor.dontuse_nth_order_forward_stage2(Tuple{typeof(self_minus2), Float64})
         # This broke some time between 1.10 and 1.11-DEV.10001
-        @test isa(self_minus2′, Core.OpaqueClosure{Tuple{Float64}, Float64}) broken=VERSION>=v"1.11-"
+        @test isa(self_minus2′, Core.OpaqueClosure{Tuple{Float64}, Float64})
         @test self_minus2′(1.0) == 2.
     end