[MC-182453] minecraft chunks won't load

minecraft chunks won't load in 1.15.2 and i can't explore the world without either glitching or falling into the void.

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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 create a new ticket.

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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i am using optifine and i'm wondering if thats the issue, because without optifine my pc lags a lot