Grapheme implementation of setText() throws IndexOutOfBoundsException

Some of the existing JCK tests are failing with IndexOutOfBoundsException
during invocation of setText(StringCharacterIterator).

Noticed that when setText() invoked with the StringCharacterIterator with the
(https://download.java.net/java/early_access/jdk20/docs/api/java.base/java/text/StringCharacterIterator.html#%3Cinit%3E(java.lang.String,int,int,int)

where 'begin' is > 0 the setText() throws IndexOutOfBoundsException.
But, the values are valid.

Please find the attached code snippet.

sample output is -
"java.lang.IndexOutOfBoundsException: Range [1, 5) out of bounds for length 4
at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:100)
at "

I see this could be a side effect of JDK-8292387

For more details on JCK failures - https://bugs.openjdk.org/browse/JCK-7318139