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RejectedExecutionException because of sendDegradedPingLater

See original GitHub issue

Hello,

Since we have updated our Android app DAVx⁵ from okhttp 3.12.5 to 3.12.7, we start receiving these exceptions:

java.util.concurrent.RejectedExecutionException: 
  at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution (ThreadPoolExecutor.java:2104)
  at java.util.concurrent.ThreadPoolExecutor.reject (ThreadPoolExecutor.java:848)
  at java.util.concurrent.ScheduledThreadPoolExecutor.delayedExecute (ScheduledThreadPoolExecutor.java:334)
  at java.util.concurrent.ScheduledThreadPoolExecutor.schedule (ScheduledThreadPoolExecutor.java:562)
  at java.util.concurrent.ScheduledThreadPoolExecutor.execute (ScheduledThreadPoolExecutor.java:654)
  at okhttp3.internal.http2.Http2Connection.sendDegradedPingLater (Http2Connection.java:598)
  at okhttp3.internal.http2.Http2Stream$StreamTimeout.timedOut (Http2Stream.java:668)
  at okio.AsyncTimeout$Watchdog.run (AsyncTimeout.kt:198)

It’s not that often, but this exception was not there before. I think it occurs when

a thread with okhttp I/O is interrupt()ed (because the user cancels the action), and
okhttp tries to send a delayed HTTP/2 ping on such an interrupted channel later.

Unfortunately, I can’t provide reliable steps to reproduce yet. Is this however a problem you can imagine to happen or do you need more information?