Glow item frames are darkened at night

@@unknown I think you are trying to describe that the glow item frame doesn't receive light from the surrounding light sources. Causing it to appear dark / grey. Is that a right assumption?

It's just fine at daytime, but at nighttime, it's too dark.

doesn't appear that nearby light sources affects it. its fine at noon, but then turned dark at mindnight, regardless of nearby light sources

affects 1.17.10

It turned dark at the time player can sleep. Affects 1.17.20.22

The brightness of the glow item frame is based on the time of the day, weather, and does not affected by any light source. You can test this inside a dark cave and try setting the time to day and night. These mean players can use item frame instead of the clock since it is more accurate to tell when you can sleep

affects 1.17.30.20

Still an issue on 1.18.0.27, however I think the title should be changed. Light blocks don't affect glow item frames, as silentwisperer and TrinhKieuLong said, it only gets affected by the time of day.

Earlier comments are correct that it is only the time of day that affects the glow item frame brightness. Placing a light source next to the glow item frame as repro step (3) states only helps to make the issue easier to notice, because then the item frame clashes more with the blocks around it.

The item inside the glow item frame remains the correct brightness at all times.