Unable to set to yarn 1

[trentlarson]

My setup has yarn 3 as the default.

% which yarn
/Users/trent/.asdf/shims/yarn
% yarn --version
3.2.4

Note that I only have yarn 1 in my list:

% asdf list yarn
  1.22.19

I would like to be able to use yarn 1, but it doesn't switch when I try:

% asdf local yarn 1.22.19
% cat .tool-versions
yarn 1.22.19
% yarn --version
3.2.4

How do I switch to yarn 1?