YARD infinitely recurses on Ruby project - ruby

Question

Ruby 3.0.0, YARD 0.9.28, Linux (Fedora 35).
Running yardoc on my project works through most of the tasks, but blows up with an apparent infinite recursion when it comes to the Serializing to doc/top-level-namespace.html. I had this problem earlier in development, but I have no idea what I did to make it go away — and now it's back.
It might have something to do with the convoluted interplay of include and extend uses; there are four modules in the project that get mixed into almost every source file in some combination or other. Regardless, this has me stumped, and I haven't found anything like it online.
Here's the tail-end of the processing (I had to pull it out of the Rake task and do it by hand because the Rake output didn't compress the repeating lines):
% bundle exec yardoc
:
:
[debug]: Parsing ["config/macros.yard", "lib/sptaf.rb", "lib/sptaf/classmethods.rb", "lib/sptaf/cli.rb", "lib/sptaf/container.rb", "lib/sptaf/debugging.rb", "lib/sptaf/exceptions.rb", "lib/sptaf/faction.rb", "lib/sptaf/feature.rb", "lib/sptaf/game.rb", "lib/sptaf/inventory.rb", "lib/sptaf/item.rb", "lib/sptaf/location.rb", "lib/sptaf/mixin/actor.rb", "lib/sptaf/mixin/container.rb", "lib/sptaf/mixin/location.rb", "lib/sptaf/mixin/thing.rb", "lib/sptaf/npc.rb", "lib/sptaf/player.rb", "lib/sptaf/version.rb"] with `ruby` parser
[debug]: Parsing config/macros.yard
[debug]: Parsing lib/sptaf.rb
[debug]: Parsing lib/sptaf/classmethods.rb
:
:
[debug]: Serializing to doc/top-level-namespace.html
bundler: failed to load command: yardoc (./vendor/bundle/ruby/3.0.0/bin/yardoc)
./vendor/bundle/ruby/3.0.0/gems/yard-0.9.28/lib/yard/code_objects/proxy.rb:101:in `path': stack level too deep (SystemStackError)
from ./vendor/bundle/ruby/3.0.0/gems/yard-0.9.28/lib/yard/code_objects/proxy.rb:129:in `equal?'
from ./vendor/bundle/ruby/3.0.0/gems/yard-0.9.28/lib/yard/code_objects/module_object.rb:15:in `block in inheritance_tree'
from ./vendor/bundle/ruby/3.0.0/gems/yard-0.9.28/lib/yard/code_objects/module_object.rb:14:in `map'
from ./vendor/bundle/ruby/3.0.0/gems/yard-0.9.28/lib/yard/code_objects/module_object.rb:14:in `inheritance_tree'
from ./vendor/bundle/ruby/3.0.0/gems/yard-0.9.28/lib/yard/code_objects/proxy.rb:180:in `method_missing'
from ./vendor/bundle/ruby/3.0.0/gems/yard-0.9.28/lib/yard/code_objects/module_object.rb:17:in `block in inheritance_tree'
from ./vendor/bundle/ruby/3.0.0/gems/yard-0.9.28/lib/yard/code_objects/module_object.rb:14:in `map'
from ./vendor/bundle/ruby/3.0.0/gems/yard-0.9.28/lib/yard/code_objects/module_object.rb:14:in `inheritance_tree'
... 10681 levels...
from /usr/share/gems/gems/bundler-2.2.33/lib/bundler/friendly_errors.rb:103:in `with_friendly_errors'
from /usr/share/gems/gems/bundler-2.2.33/libexec/bundle:37:in `<top (required)>'
from /home/coar/bin/bundle:23:in `load'
from /home/coar/bin/bundle:23:in `<main>'
Here is the .yardopts file it is using:
--charset="utf-8"
--verbose
--debug
--backtrace
--no-cache
--title="Text Adventure Framework (TAF) Gem"
--private
--embed-mixins
--markup-provider="rdiscount"
--markup="markdown"
config/macros.yard
lib/sptaf.rb
lib/sptaf/classmethods.rb
lib/sptaf/cli.rb
lib/sptaf/container.rb
lib/sptaf/debugging.rb
lib/sptaf/exceptions.rb
lib/sptaf/faction.rb
lib/sptaf/feature.rb
lib/sptaf/game.rb
lib/sptaf/inventory.rb
lib/sptaf/item.rb
lib/sptaf/location.rb
lib/sptaf/mixin/actor.rb
lib/sptaf/mixin/container.rb
lib/sptaf/mixin/location.rb
lib/sptaf/mixin/thing.rb
lib/sptaf/npc.rb
lib/sptaf/player.rb
lib/sptaf/version.rb
-
CHANGELOG.md
CODE_OF_CONDUCT.md
LICENCE.md
README.md
TODO.md
My apologies if the #documentation tag is inappropriate here; it says it's for questions about document generators, which seems to kinda fit.
As always, thanks for reading and particularly for any kind feedback!