MonoBehaviour.Invoke

Invoke, InvokeRepeating, CancelInvoke (all or by name) and IsInvoking (Scripting/DelayedCalls.cs), from a new invoke scenario recorded in Unity: calls run after Update (after the coroutines) once due before the next frame (time + deltaTime), a frame before a WaitForSeconds of the same length; due calls run in time order, ties in call order; zero and negative delays run in the same frame; an invoke made by an invoked method runs in a second pass after LateUpdate; repeating calls advance from their due time, rate 0 calls once, rates up to 0.00001 throw Unity's UnityException; private and inherited parameterless methods are found; disabled components and inactive GameObjects keep their calls, destroyed components lose them.
51 scenarios pass on the JIT, through the editor's JSON form, and on NativeAOT.
From the coverage page, the next common gaps: Physics casts (SphereCastAll, BoxCastAll, the NonAlloc forms), Physics.IgnoreCollision, Time.timeSinceLevelLoad and smoothDeltaTime, Screen's resolution and full-screen API, Unity 6's named colors, Renderer property blocks, Collider2D/Rigidbody2D casts and contacts.