diff --git a/base/compiler/abstractinterpretation.jl b/base/compiler/abstractinterpretation.jl
index 5aa7669c3a3a9..581f8226a3829 100644
--- a/base/compiler/abstractinterpretation.jl
+++ b/base/compiler/abstractinterpretation.jl
@@ -799,8 +799,7 @@ function const_prop_enabled(interp::AbstractInterpreter, sv::InferenceState, mat
         add_remark!(interp, sv, "[constprop] Disabled by parameter")
         return false
     end
-    method = match.method
-    if method.constprop == 0x02
+    if is_no_constprop(match.method)
         add_remark!(interp, sv, "[constprop] Disabled by method parameter")
         return false
     end
@@ -1003,7 +1002,7 @@ function is_all_overridden((; fargs, argtypes)::ArgInfo, sv::InferenceState)
 end
 
 function force_const_prop(interp::AbstractInterpreter, @nospecialize(f), method::Method)
-    return method.constprop == 0x01 ||
+    return is_aggressive_constprop(method) ||
            InferenceParams(interp).aggressive_constant_propagation ||
            istopfunction(f, :getproperty) ||
            istopfunction(f, :setproperty!)
diff --git a/base/compiler/utilities.jl b/base/compiler/utilities.jl
index 7ef006f244aa6..82748669e4387 100644
--- a/base/compiler/utilities.jl
+++ b/base/compiler/utilities.jl
@@ -209,6 +209,20 @@ function specialize_method(match::MethodMatch; kwargs...)
     return specialize_method(match.method, match.spec_types, match.sparams; kwargs...)
 end
 
+"""
+    is_aggressive_constprop(method::Union{Method,CodeInfo}) -> Bool
+
+Check if `method` is declared as `Base.@constprop :aggressive`.
+"""
+is_aggressive_constprop(method::Union{Method,CodeInfo}) = method.constprop == 0x01
+
+"""
+    is_no_constprop(method::Union{Method,CodeInfo}) -> Bool
+
+Check if `method` is declared as `Base.@constprop :none`.
+"""
+is_no_constprop(method::Union{Method,CodeInfo}) = method.constprop == 0x02
+
 #########
 # types #
 #########
diff --git a/test/compiler/inline.jl b/test/compiler/inline.jl
index 94331da6a7d03..a11fdbd2b6203 100644
--- a/test/compiler/inline.jl
+++ b/test/compiler/inline.jl
@@ -1402,3 +1402,49 @@ end
         end
     end
 end
+
+# https://github.com/JuliaLang/julia/issues/45050
+@testset "propagate :meta annotations to keyword sorter methods" begin
+    # @inline, @noinline, @constprop
+    let @inline f(::Any; x::Int=1) = 2x
+        @test ccall(:jl_ir_flag_inlineable, Bool, (Any,), only(methods(f)).source)
+        @test ccall(:jl_ir_flag_inlineable, Bool, (Any,), only(methods(Core.kwfunc(f))).source)
+    end
+    let @noinline f(::Any; x::Int=1) = 2x
+        @test !ccall(:jl_ir_flag_inlineable, Bool, (Any,), only(methods(f)).source)
+        @test !ccall(:jl_ir_flag_inlineable, Bool, (Any,), only(methods(Core.kwfunc(f))).source)
+    end
+    let Base.@constprop :aggressive f(::Any; x::Int=1) = 2x
+        @test Core.Compiler.is_aggressive_constprop(only(methods(f)))
+        @test Core.Compiler.is_aggressive_constprop(only(methods(Core.kwfunc(f))))
+    end
+    let Base.@constprop :none f(::Any; x::Int=1) = 2x
+        @test Core.Compiler.is_no_constprop(only(methods(f)))
+        @test Core.Compiler.is_no_constprop(only(methods(Core.kwfunc(f))))
+    end
+    # @nospecialize
+    let f(@nospecialize(A::Any); x::Int=1) = 2x
+        @test only(methods(f)).nospecialize == 1
+        @test only(methods(Core.kwfunc(f))).nospecialize == 4
+    end
+    let f(::Any; x::Int=1) = (@nospecialize; 2x)
+        @test only(methods(f)).nospecialize == -1
+        @test only(methods(Core.kwfunc(f))).nospecialize == -1
+    end
+    # Base.@assume_effects
+    let Base.@assume_effects :notaskstate f(::Any; x::Int=1) = 2x
+        @test Core.Compiler.decode_effects_override(only(methods(f)).purity).notaskstate
+        @test Core.Compiler.decode_effects_override(only(methods(Core.kwfunc(f))).purity).notaskstate
+    end
+    # propagate multiple metadata also
+    let @inline Base.@assume_effects :notaskstate Base.@constprop :aggressive f(::Any; x::Int=1) = (@nospecialize; 2x)
+        @test ccall(:jl_ir_flag_inlineable, Bool, (Any,), only(methods(f)).source)
+        @test Core.Compiler.is_aggressive_constprop(only(methods(f)))
+        @test ccall(:jl_ir_flag_inlineable, Bool, (Any,), only(methods(Core.kwfunc(f))).source)
+        @test Core.Compiler.is_aggressive_constprop(only(methods(Core.kwfunc(f))))
+        @test only(methods(f)).nospecialize == -1
+        @test only(methods(Core.kwfunc(f))).nospecialize == -1
+        @test Core.Compiler.decode_effects_override(only(methods(f)).purity).notaskstate
+        @test Core.Compiler.decode_effects_override(only(methods(Core.kwfunc(f))).purity).notaskstate
+    end
+end