@ToroMaduro, can you let us know a few more things? First, what’s the heap max is for your lucee 6 instance? I don’t see any mention or or request for that. It might matter. And even if you’d say it’s “the same as lucee 5 was”, please confirm and report that value as well.
Also, is the Java 11 you report the same in both implementations?
And let us know if you see confirming these values in the lucee admin. If not, then by what means?
And the implication is that these are both tested on the same machine. Can you confirm? If not the same, what differs?
And was lucee installed the same way on both? There are of course many ways to run it.
I know these are not answers, and they point away from the presumption that there’s a bug, or that this matter of data types is the crucial thing. Those may well be the problem. I just want to help rule out other reasonable possible explanations for the difference, which should be easy to do here.