THIS IS A TEST INSTANCE. Feel free to ask and answer questions, but take care to avoid triggering too many notifications.

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Will you (please) open an issue for this on Wireshark Gitlab Issues?
It looks like it came in with 12173: x75: Add dissector for X.75 SLP/MLP.
Try a Wireshark from the 4.0 branch (I tested with 4.0.12) - the decode looks like your test1.txt.