[MC-242917] When upgrade the old world, the light block doesn't shine. (It's working only when it's placed again)

(2021/11/27: edited to Vanilla's screenshot)

When upgrade the old world, the light block doesn't shine. (It's working only when it's placed again)

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Thank you for your report!
However, this issue is Invalid.

Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.

Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers, such as The Hive and Hypixel, please contact them first as they run modified server software.

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now edited to vanilla screenshot.

It's the second most serious problem after the world optimization problem.

Please fix it quickly, and read this issue: https://bugs.mojang.com/browse/MC-239962

this is a problem just don t say becacause of mods its invalid this even is in world generator its realy old bug