A third-party addon (e.g. AtlasLoot) registers an AceComm prefix longer
than the client's 16-character limit. Because Questie's bundled AceComm is
the LibStub winner and its xpcall polyfill wraps AceAddon's OnEnable, the
upstream hard error() in RegisterComm surfaced as a recurring Lua error at
every login (seen on ChromieCraft).
The prefix can never work on the client regardless, so RegisterComm now
warns once and skips the registration for over-long prefixes instead of
throwing, leaving the calling addon's OnEnable intact and removing the
error popup.
Xurkon