endFrame composites a world override mirrored on LOVE 12, because a
pipeline's own projection pre-flips Y. ctx.drawFx puts the standing
effects into that same canvas as ordinary 2D, so the mirror inverts them
instead of righting them: a trainer's "!" draws upside down, below its
feet, on the mirrored half of the screen.
The condition is now Renderer.mirrorsWorldOverride, named because it is
not only the blit's business, and ctx.drawFx runs its block under the
matching mirror about the bound canvas. project() is left alone: it
already answers in screen rows.
Colson Rice