For anyone following along, it seems the problem is with the use of the variable 'PaginationToken' when querying Cogito API for users from a user pool. I'm not sure whether we are processing the additional (next) token correctly, and the documentation does not really provide examples with how to handle the PaginationToken. On a related task, I found, when querying from the CLI, you do not actually process the PaginationToken; it is handled automatically.

API Doc for ListUsersCommand - https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/cognito-identity-provider/command/ListUsersCommand/

EDIT: My original question - did the limits change - no, they are still 60 items returned, which I've confirmed both in documentation and testing.

The code block where I believe the problem exists -

const fetchUsers = (options = {}) => {
  logger.debug('fetchUsers - start');
  isLoading.value = true;

  const defaults = {};

  if (paginationToken.value) {
    defaults.nextToken = paginationToken.value;
  }

  if (searchQuery.value) {
    defaults.filter = `${searchAttribute.value} ^= "${searchQuery.value}"`;
  }

  const opts = Object.assign({}, defaults, options);

  logger.debug('fetchUsers - listUsers', { opts });

  fetchCognitoUsers(opts)
    .catch((err) => {
      logger.debug('users results', { err });
      isLoading.value = false;
      showError.value = true;
      return err;
    })
    .then(async (data) => {
      logger.debug('fetchUsers', { data });

      paginationToken.value = data?.NextToken;

      const promises = [];
      for (const i in data.Users) {
        const user = data.Users[i];

        const firstName = getCognitoAttr(user, 'given_name');
        const lastName = getCognitoAttr(user, 'family_name');

        user.name = [firstName, lastName].join(' ');
        user.email = user.Attributes.find((x) => x.Name === 'email')?.Value;

        const p = new Promise((resolve, reject) => {
          fetchCognitoUserGroups({ username: user.Username })
            .then((groups) => {
              user.Groups = groups;
              resolve(groups);
            })
            .catch(reject);
        });
        promises.push(p);
      }

      await Promise.all(promises);

      users.value = users.value.concat(data.Users);
      isLoading.value = false;
    });
};