It's both a hub and a client issue. See commits on:
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a8d24177d946de4f1f0a0fe1af9a1338:/page/commits.mu`g=forks|r=rrcd|ref=HEAD
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The 28c7c1a68c735693aa8e6b8193ed44b2 hub is running my fork, which has fixes for large who-list responses.
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Nomadnet also implemted fixes to handle large who-list responses recently-ish, so see the commit log there as well :)