Noticed this while trying to place crops. They couldn't be placed because the light level calculated was too low, but upon causing a block update to light source, the light level is temporarily fixed. Despite appearing fixed, the crops still can't be placed and reloading the chunks cause light level to revert back. I tried this with glowstone, torches, and glowshrooms.
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Not exactly Anthony. The differences are that this world was generated for the version it's in, and that there's no way to fix it for me, they just go back to the wrong lightning once the chunks are reloaded.
In your worlds list, can you try highlighting your world, clicking the 'Edit' button in the bottom left, and executing the "Optimize World" option to see if that fixes it?
Additionally; can you provide any more information such as:
1. If you recently updated the world from one version to another
2. If this also occurs in singleplayer (Your enviornment states a server)
Does MC-243107 describe your issue?