When the campfire_cosy_smoke particles stack at one point, they start to look transparent and other translucent particles (like ambient_entity_effect, cloud, etc) are not rendered through them. This effect dissapears if there are a lot of other translucent particles close. If the particles are not translucent, such as minecraft:angry_villager or minecraft:crit, the campfire particles will continue to look transparent.
Purple lines also appear where the campfire particles are.
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Additionally the line issue is MC-149630 (which most of us are unable to reproduce).
Thank you for your report!
However, this issue is a Duplicate of MC-161898.
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