[CI] ModelLoaderUtilsTests testSplitIntoRanges failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic-platform-support #6560 / oraclelinux-9_platform-support-unix
• elasticsearch-periodic-platform-support #6434 / rhel-8_platform-support-unix

Reproduction Line:

./gradlew ":x-pack:plugin:ml-package-loader:test" --tests "org.elasticsearch.xpack.ml.packageloader.action.ModelLoaderUtilsTests.testSplitIntoRanges" -Dtests.seed=62BD0D92CDCAE68D -Dtests.locale=ta-IN -Dtests.timezone=US/East-Indiana -Druntime.java=23

Applicable branches:
8.x

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: 
Expected: a collection with size <8>
     but: collection size was <7>

Issue Reasons:

• [8.x] 2 failures in test testSplitIntoRanges (0.2% fail rate in 863 executions)
• [8.x] 2 failures in pipeline elasticsearch-periodic-platform-support (10.5% fail rate in 19 executions)

Note:
This issue was created using new test triage automation. Please report issues or feedback to es-delivery.

[elasticsearchmachine]

This has been muted on branch 8.18

Mute Reasons:

• [8.18] 2 failures in test testSplitIntoRanges (0.6% fail rate in 352 executions)

Build Scans:

• elasticsearch-intake #17343 / part4
• elasticsearch-periodic-platform-support #6152 / ubuntu-2004-aarch64_checkpart4_platform-support-arm

[elasticsearchmachine]

Pinging @elastic/ml-core (Team:ML)

[davidkyle]

This reproduces with the reproduce line above. Looks like random testing found a corner case

    Expected: a collection with size <9>
         but: collection size was <8>                                                                                                                                            at __randomizedtesting.SeedInfo.seed([FB913A7FEA45DDB7:8A6793CF7CA2B513]:0)
        at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:18)
        at org.elasticsearch.test.ESTestCase.assertThat(ESTestCase.java:2629)
        at org.elasticsearch.xpack.ml.packageloader.action.ModelLoaderUtilsTests.testSplitIntoRanges(ModelLoaderUtilsTests.java:121)

[Jason-Whitmore]

May I work on this issue? I believe I know the solution.