Yeah, that’s so strange to me. It sounds like your toon shader is having a hard time interacting with the bloom, though I would think you would have noticed a difference when you changed the bendable location. Try disabling Bloom (and just to be safe, also Motion Blur and any Depth of Field settings) in your postprocess settings and seeing if that helps.
Hell, if that doesn’t work, let’s try disabling the tonemapper. You can follow this quick tutorial to do so, just write down any settings you’re overwriting so you can reenable it later.
If none of this is working, to be honest I’m about out of ideas. If you haven’t already, I would suggest creating a build of your game to confirm this issue isn’t just in-editor. If you’re still seeing it, at that point I would recommend trying a different toon shader. Here’s an alternative that might work for you (the second one): (Tutorial) Ultra-Simple Cel-Shading Implementation - #2 by juanlink661