Maps are showing (what I assume is lava and things) underground things on them, I know this was an issue back in 20w17a but people were saying its fixed
Environment
CPU: i9 9900k, GPU: radeon 590x, 32GB DDR4 RAM, Windows 10, Java 1.8.0_231
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Comments 2
See moderator note at MC-179858
You need to optimize your world and erase cached data.