Description:

UAL0010/UAL0013 instruct you to add an AutoStaticsCleanup or NoAutoStaticsCleanup attribute. Doing exactly that turns the warning into a hard CS0260 error, because the attribute drives a source generator that emits a partial declaration - so the type must also be declared partial, which the warning never mentions. The required namespace is not mentioned either.

Steps to reproduce:

Install 6000.7.0a5 and create a new project from the Universal 2D template
Wait for the initial import to finish and confirm the Console window is empty
Open Edit > Project Settings > Editor and scroll to Enter Play Mode Settings
Set the "When entering Play Mode" dropdown to "Do not reload Domain or Scene"
In the Project window, create Assets/Probe.cs (Right-click the empty grey area of the right-hand pane → Create > Scripting > Empty C# Script.) with exactly this content

public static class Probe
   {
       public static float Value { get; set; }
   }

Save the file and let the Editor recompile. In the Console window, make sure the warning filter (the yellow triangle, top right) is enabled
Observe the Console: Checkpoint 1 - two warnings are reported and no errors: UAL0010 on the type declaration and UAL0013 on the static property.
Open Assets/Probe.cs and apply the fix exactly as the warning instructs - add the attribute and the namespace it lives in, nothing else:

using Unity.Scripting.LifecycleManagement;

    [AutoStaticsCleanup]
    public static class Probe
    {
        public static float Value { get; set; }
    }

Save and let the Editor recompile. Checkpoint 2 - the warnings clear and compilation fails with CS0260

Actual results: At checkpoint 1 - both rules fire on the same four-line type, one on the declaration and one on the property:

Assets/Probe.cs(1,21): warning UAL0010: A type with static fields, automatic properties or
                       events must have an AutoStaticsCleanup or NoAutoStaticsCleanup
                       attribute. Static members: Value.

Assets/Probe.cs(3,25): warning UAL0013: A type with static fields, automatic properties or
                       events must have an AutoStaticsCleanup or NoAutoStaticsCleanup
                       attribute.

At checkpoint 2:

error CS0260: Missing partial modifier on declaration of type 'Probe';
              another partial declaration of this type exists

Expected results: The warning names all three requirements - the attribute, the partial modifier, and the Unity.Scripting.LifecycleManagement namespace. None of the three appear in the message; the namespace had to be found by grepping installed Unity source.

Reproducible with versions: 6000.7.0a5

Not reproducible with versions: 6000.6.0b8, 6000.5.7f1, 6000.3.23f1, 6000.0.80f1

Tested on (OS): MacBook Pro - Tahoe 26.6.1