Gameplay Effect Modifiers with Target Tags are Applied Incorrectly

If you have a Gameplay Effect that uses an Attribute Modifiers, and this modifier has Target Tags specified, the modifier is applied unexpectedly:

• Adding a Required tag on the Target, the modifier does not take effect even if the Target has the tag
• Adding an Ignore tag on the Target, the modifier always takes effect even if the Target doesn't have the tag

The way I did this was just to (in Lyra) create a GE that is set to Instant, then go to the Attribute Modifiers and do Healing to -5.  Execute it with the AbilitySystem.Effect.Apply -Server command (it may say it's not executed properly – thats a diff bug, but it will actually execute).

See if your health goes down.  If it does, it's working.

So now you have to modify that GE again and change the "MustHave" tags or "MustNotHave" tags on the modifier, and see if it also executes/doesn't execute as expected.

Using the new Gameplay Debugger GAS functionality will help (it's the apostrophe / ' key).