Crash during Periodic Damage test for Gameplay Abilities system in the Network Prediction plugin, when both plugins are enabled. Related to a null GameInstance.
With Gameplay Abilities and Network Prediction plugins enabled in your project, or using the attached project, attempt to run the "Periodic Damage" test through the Automation tab in the Session Frontend window, under System->AbilitySystem -> GameplayEffects -> Test_PeriodicDamage.
Using either a 4.26.0 copy of the engine from EGL, or the latest from our 4.26 branch in GH, you should experience a crash in FNetworkPredictionTrace::TraceWorldFrameStart due to GameInstance being null in this context.
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-107346 in the post.