20 0 4 & -2 0 9

[radiant otter]

These are chunks that are bugged, their tracks that are decorated with slabs are realy dark until a train drives over them, I don't know if decorating tracks is an SnR feature, but I've never had this problem before

[jolly gate]

Hello @radiant otter! Someone will help you shortly, please do not ping moderators or other people and just wait for someone to come help. While waiting please check out #faq to see if it already answers your question.

[lusty walrus]

are you using shaders

are you using optifine

try cycling through the flywheel backends /flywheel backend off
/flywheel backend indirect/batching
/flywheel backend instancing

[radiant otter]

nop