(Orthographic) Objects Placed Behind Rendering in Front

See attached screenshot first:

I’m having an issue where some objects placed in the background of my level will render in front of the player character, despite being 200-300 units behind them in the negative Y direction. In that sample screenshot you can see this happening with the blurry blue plant. That object is quite a ways behind the player character in space. The darker rocks behind the character are also in the background, and those render correctly. From what I have been able to piece together, it only happens with Translucent materials.

Has anyone run into this, or have any ideas about a fix? Feel free to ask me any questions, I’m not sure where to start. I’m running 4.20.