UE 5.2 Translucency Material Issue

I recently upgraded from 5.1 to 5.2 for my project.
There’s a really strange issue starting to happen after the version migration.
All of the translucent material will “vanish” based on certain camera angle if out of certain distance range.
I demonstrated it with the video below.
As you can see I set up a 2D plane of a dark blob rotating and always facing the player’s camera, when it rotates to certain angle, it starts vanishing, almost hard to see it anymore.
This behavior happens on all of the translucent materials.
Could anyone please share some hints? I really have no idea what’s going on or what to do now…

I did more observation into this matter - it seems when translucent planes are placed in between light sources, it’s more likely to “vanish”, but not as much in places that has simple or no light source.

Hmm, what specific translucency settings are you using for this object? Shading model/lighting model.

The shader is as simple as a bare minimum translucent materal.

The 2 light source behind it are default spot lights.

I also have several post processing volumes, I disabled them and this still happens so I don’t think it’s related to the post processing thing, maybe directly related to the shader… it’s really strange.
Plus, this wasn’t happening before I upgraded to UE 5.2, so I guess it might have something to do with the new version of the engine or the migration process? but what could go wrong?