Well, the first first bug is simple to solve, I couldn't reproduce the second (all vanilla including AI):

The drawing system doesn't handle the possibility of an already awakened slumbering ruins on a non-occupied planet (IE razed/evacuated/lost). Fails to handle that situation and may hang the game indefinitely (endless pending turn bug).

The error is on the Assembly-Csharp main DLL.

Can be solved by checking if it is occupied with this.MainColonizedStarSystem != null. Here's a fixed version of the function that otherwise fails. Works 100%:

On Class StarSystemLabel.cs:

private void RefreshSlumberingRuinsContextualIcon()

{

    this.ContextualIconSlumberingRuins.Visible = false;

    if (this.VisibilityLayer >= EntityVisibility.Layer.Known && this.StarSystemNode != null && this.StarSystemNode.IsSlumberingRuinsSystem && Gui.PlayerEmpire.CanSeeSlumberingRuins)

    {

        this.ContextualIconSlumberingRuins.Visible = true;

        if (this.StarSystemNode.IsAwokenSlumberingRuinsSystem)

        {

            this.ContextualIconSlumberingRuins.AgeTooltip.Content = Gui.Localize("%SlumberingRuinsAwakenedStarSystemLabel");

        }

        else

        {

            this.ContextualIconSlumberingRuins.AgeTooltip.Content = Gui.Localize("%SlumberingRuinsStarSystemLabel");

        }

        if (this.MainColonizedStarSystem != null)

        {

            this.ContextualIconSlumberingRuins.Children[1].AgePrimitive.TintColor = this.MainColonizedStarSystem.Empire.Color;

            return;

        }

        this.ContextualIconSlumberingRuins.Children[1].AgePrimitive.TintColor = Color.white;

    }

}