Failing seed for StreamMergeSuite

I came across a failing prop for StreamMergeSuite while trying to debug some platform-specific issues related to CE3.

==> X fs2.StreamMergeSuite.merge - left/right failure - 2 - never-ending flatMap, failure after emit  0.037s munit.FailException: /home/horizon/Desktop/projects/fs2/core/shared/src/test/scala/fs2/StreamMergeSuite.scala:44
43:
44:      test("2 - never-ending flatMap, failure after emit") {
45:        forAllF { (s1: Stream[Pure, Int]) =>
Failing seed: ZCxsQM1MSYGTOwxjKwtv_cuDjvVN0-hxicvKX_VSr_M=
You can reproduce this failure by adding the following override to your suite:

  override val scalaCheckInitialSeed = "ZCxsQM1MSYGTOwxjKwtv_cuDjvVN0-hxicvKX_VSr_M="

Exception raised on property evaluation.
> ARG_0: Stream(..)
> Exception: munit.FailException: /home/horizon/Desktop/projects/fs2/core/shared/src/test/scala/fs2/StreamMergeSuite.scala:50 Expected an exception of type fs2.Err but got a result: ()
49:            .drain
50:            .assertThrows[Err]
51:        }

Another failing seed for the same test hP-8mu5fDOvtStGfsFrK5SSr1mQDrJnJya3xaUwSwQC=.

FWIW this was seen on openjdk8 on an ubuntu VM running inside vmware fusion for mac.

Start with core/shared/src/test/scala/fs2/StreamMergeSuite.scala, especially the test at lines 44-50. Reproduce it by overriding scalaCheckInitialSeed with one of the reported seeds, then inspect why the never-ending flatMap case returns successfully instead of raising fs2.Err; done means the property passes for the reported seeds.