My guess is that an older 32-bit version of Java was not causing the issue (that particular limitation of the relaxNG engine was introduced with a particular version of the 32-bit java if I recall correctly). That's why increasing the stack or installing the 64-bit version was recommended back then. Your upgrade to Windows 11 more than likely included an upgrade to the pre-existing (and likely non-problematic) 32-bit java, and that's what caused your problem.
Nothing nefarious or unusual in the "com.thaiopensource" message. That's a normal part of EPubCheck. The issue had nothing to do with your particular epub including (or not including) Asian languages.
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