[BUG] failing transformer test for develop

[dizzzz]

needs investigation (develop)

Error: core] [ERROR] Tests run: 754, Failures: 1, Errors: 0, Skipped: 4, Time elapsed: 13.35 s <<< FAILURE! -- in xquery.xquery3.XQuery3Tests
Error: core] [ERROR] xqts.org.exist-db.xquery.test.function_transform.transform-67 -- Time elapsed: 0.015 s <<< FAILURE!
org.junit.ComparisonFailure: expected:<[ (assertTrue failed.)]> but was:<[false]>
[exist-core] [INFO] 
[exist-core] [INFO] Results:
[exist-core] [INFO] 
Error: core] [ERROR] Failures: 
Error: core] [ERROR]   expected:<[ (assertTrue failed.)]> but was:<[false]>
[exist-core] [INFO] 
Error: core] [ERROR] Tests run: 5784, Failures: 1, Errors: 0, Skipped: 105
[exist-core] [INFO] 

looks reproducible, maybe timing issue

[line-o]

It looks like a race condition. This transformer test 67 is flaky since a long time. Re running it several times will make it pass eventually. I would be open to skip it if we can't make it pass reliably. This is of course only possible after making sure there is no real issue.

[line-o]

same goes for transform tests 66 and 11-2

[duncdrum]

would be good to investigate after #6036