Test: BufferWriterDoesNotLeak also fails on my machine

[TimLovellSmith]

Test Name: Pipelines.Sockets.Unofficial.Tests.BufferWriterTests.BufferWriterDoesNotLeak
Test Outcome: Failed
Result StackTrace: at Pipelines.Sockets.Unofficial.Tests.BufferWriterTests.BufferWriterDoesNotLeak() in C:\repo\Pipelines.Sockets.Unofficial\tests\Pipelines.Sockets.Unofficial.Tests\BufferWriterTests.cs:line 94
Result Message:
Assert.Equal() Failure
Expected: 4
Actual: 7
Result StandardOutput:
before flush, wrote 0... (nil)
after flush: (nil)
before flush, wrote 5... [0,5) - 11/11 available; counts: 1/
after flush: [5,5) - 11/11 available; counts: 2/
before flush, wrote 10... [5,15) - 1/1 available; counts: 2/
after flush: [15,15) - 1/1 available; counts: 3/
before flush, wrote 15... [15,30) - 1/1 available; counts: 1/
after flush: [30,30) - 1/1 available; counts: 2/
before flush, wrote 20... [30,50) - 11/11 available; counts: 1/1/
after flush: [50,50) - 11/11 available; counts: 2/