Oblivion regression exposed by video description patch

[DL]

I found a regression in Oblivion that results in flickering shadows.It requires the video driver/description patch in order to see it, otherwise shadows don't work at all.Since the patch itself is probably not causing the issue, should I post a bug report?
I believe the issue may be in The Last Remnant as well, but I'm not sure it's the same issue (and it happens very infrequently, unlike in Oblivion)

Here's the regression:

2cb8f42168aa9b00b8dd511a6e5828b45088cbba is first bad commit
commit 2cb8f42168aa9b00b8dd511a6e5828b45088cbba
Author: Stefan Dösinger <[email protected]>
Date: Fri May 8 17:24:01 2009 +0200

wined3d: Support clipplanes with GLSL.

This is the Nth attemt to make clipping work with GLSL shaders. The patch now
uses the GLSL quirk table to handle cards that need a custom varying for
gl_ClipPos, and the code is adapted to the changed state table and shader
backend system.

Patch that exposes this regression: http://bugs.winehq.org/attachment.cgi?id=20312

[vitamin]

Since the patch itself is probably not causing the issue, should I post a bug report?

Yes, it's still a bug.

The required patch to trigger it only changes card description and nothing else. Most likely triggering a different codepath inside the game.