I can make this error pop up at any time, by pressing "j" for the guild community tab.

1x [ADDON_ACTION_FORBIDDEN] AddOn 'DontCast' tried to call the protected function 'GuildControlSetRank()'.
AdiBags\libs\BugGrabber\BugGrabber.lua:573: in function <AdiBags\libs\BugGrabber\BugGrabber.lua:573>
[C]: in function GuildControlSetRank' ...\Blizzard_GuildControlUI\Blizzard_GuildControlUI.lua:24: in function <...\Blizzard_GuildControlUI\Blizzard_GuildControlUI.lua:7> [C]: ? [C]: in function LoadAddOn'
FrameXML\UIParent.lua:445: in function UIParentLoadAddOn' FrameXML\UIParent.lua:691: in function Communities_LoadUI'
FrameXML\UIParent.lua:925: in function ToggleCommunitiesFrame' FrameXML\UIParent.lua:812: in function ToggleGuildFrame'
[string "TOGGLEGUILDTAB"]:1: in function <[string "TOGGLEGUILDTAB"]:1>

Sorry, for some reason never got a notification about this, but this should have been resolved by 1ff1b0a