Sometimes the lead connecting the wandering trader to its llamas "detatches" from the trader and appears to get "stuck" at one point. The llamas still follow the trader. The leads will appear to render from wherever the trader was, to the llamas. The lead can go through blocks and stretch fairly far distances (~45 blocks+).
If I'd take a stab at this, I'd guess that the lead updates the position of the mobs involved every so often, and then sometimes the position the trader is at gets "stuck" to the lead, so it stays in one spot.
Environment
Windows 10 Home
Java 1.8.0_51, 64 bit
Intel i3-4030 @ 1.90 GHz
16 GB RAM installed, 4 GB allocated to Minecraft
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However, this issue is a Duplicate of MC-153980.
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