Question Understanding why using a Color Lookup Texture decreases Bloom effect, even with a neutral LUT

Hello!

I was wondering if anyone could help explain why using the Post Processing effect "Color Lookup" ends up lowering the effect of my Bloom, even when the LUT texture in use is a neutral one. I'm guessing it has something to do with the way Bloom is calculating threshold, but I just don't have enough know-how in this area to fully understand what's going on.

Here's the scene with Bloom, without LUT:


And here's the scene with LUT turned on in the Post Processing volume:


The bloom effect has been diminished, even though the LUT texture being used is neutral. To prove this, here's the same scene with bloom turned off, just to show that the neutral LUT texture isn't actually affecting anything else.

Same scene without Bloom, without LUT:


And the scene without Bloom, but with the neutral LUT turned back on:


Thanks in advance for any help understanding this!

Cheers,
Chris