`power_assert` didn't show `.class` result sometimes with Ruby 3.4

I faced flaky result with Ruby 3.4.2 and power_assert.

https://github.com/hsbt/minitest-power_assert/actions/runs/13891945806/job/38865298257

# success
❯ rake test
Run options: --seed 18518

# Running:

.    assert { "0".class == "3".to_i.times.map {|i| i + 1 }.class }
                 |     |      |    |     |                |
                 |     |      |    |     |                Array
                 |     |      |    |     [1, 2, 3]
                 |     |      |    #<Enumerator: 3:times>
                 |     |      3
                 |     false
                 String
.......

Finished in 0.029726s, 269.1247 runs/s, 672.8117 assertions/s.

8 runs, 20 assertions, 0 failures, 0 errors, 0 skips
# failed 
❯ rake test
Run options: --seed 57838

# Running:

....    assert { "0".class == "3".to_i.times.map {|i| i + 1 }.class }
                       |      |    |     |
                       |      |    |     [1, 2, 3]
                       |      |    #<Enumerator: 3:times>
                       |      3
                       false
F...

Finished in 0.030614s, 261.3184 runs/s, 653.2959 assertions/s.

The above issue is happend with one out of every five fails.

Start by reproducing the issue with rake test on Ruby 3.4.2, using the assertion and successful and failed output shown here. Compare the generated power-assert output across repeated runs; done means the .class result is rendered consistently and the regression is covered by a test.