The glow outline on signs z-fights with the text shadow that appears when shadow_color is defined.

Steps to Reproduce:

1. Run /setblock ~ ~ ~ oak_sign{front_text:{messages:['{text:"test",shadow_color:[0.5,0.5,0.5,1.0]}','""','""','""'],has_glowing_text:true}}
2. Observe the sign from different camera angles and distances

Observed Results:

The sign's glow outline z-fights with the text shadow

Expected Results:

The sign's glow outline appears in front of the text shadow, as it does when close to the sign.