I had this issue prior to the new patch as well, but did not record it.
Version: 1.3.44 - Public
Where: Lost Mines dungeon, final encounter room with boss.
How: Cast Shine on the Ogre Zombie, it failed, but did not take effect. Failing the save should light it up but it still shows as unlit and the spell attacks were still at disadvantage. I sent a screenshot via email with the save file.
Who: Level 4 human shock arcanist wizard
Save: Existing save I was using for this run