The scissor rect needs to be updated when the viewport changes in the Metal renderer
diff --git a/src/render/metal/SDL_render_metal.m b/src/render/metal/SDL_render_metal.m
index 4616a26..74252ba 100644
--- a/src/render/metal/SDL_render_metal.m
+++ b/src/render/metal/SDL_render_metal.m
@@ -1362,6 +1362,7 @@ METAL_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *ver
SDL_memcpy(&statecache.viewport, &cmd->data.viewport.rect, sizeof (statecache.viewport));
statecache.projection_offset = cmd->data.viewport.first;
statecache.viewport_dirty = SDL_TRUE;
+ statecache.cliprect_dirty = SDL_TRUE;
break;
}