Variables are lost after callonce java.lang.Thread.sleep()

[Serob]

After updating to 1.5.0.RC3 or 1.4.1 from the version 1.1.0.RC3 variables started to be lost after using callonce sleep call. And sleep is def sleep = function(pause){ java.lang.Thread.sleep(pause * 1000) }

Here's a Minimal, Reproducible Example.

Expected behavior:
Should print values of myVarName and localVar after callonce sleep.

Actual behavior:
throws an exception for each of them:

org.graalvm.polyglot.PolyglotException: ReferenceError: "myVarName" is not defined

org.graalvm.polyglot.PolyglotException: ReferenceError: "localVar" is not defined

[Serob]

It is working fine with call instead of callonce