Potentially flaky test: ManagerRepoIT.testFindSplitsUnsplittable

[kevinrr888]

Test name(s)
ManagerRepoIT.testFindSplitsUnsplittable

Describe the failure observed
Test occasionally fails here:

accumulo/test/src/main/java/org/apache/accumulo/test/fate/ManagerRepoIT.java

Line 259 in f17c15a

assertNotNull(preSplit);

Testing Environment:
main/4.0
5e4e551

Additional context
Noticed while working on my own branch with my own loosely related changes but confirmed failure occurs on main/4.0 branch. Used 5e4e551. Possible it could have been fixed in a newer commit. Tried on newest commit after seeing the failure on 5e4e551, but was not able to reproduce. I did not look into the logic/why it might be failing.