Fully invis AFK wraiths?

Has anyone else seen an influx of completely invisible (none of the shimmery/partially visible silhouette) AFK Wraiths in their games? I don't really care if people do it, but how are they completely invis? Like the only way you find them is based on their growls. Just noticed quite a few more over the last week, probably 2 per day. Lmk! :D

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