I have the same problem. When I deploy the aspose library aspose-words-19.5-jdk17.jar on Tom Cat 8.
Thanks for you investigation and reply.
After many tests I found that the tomcat error appear since Aspose version 18.12 (aspose-words-18.12-jdk16.jar).
With the version 18.10 (aspose-words-18.10-jdk16.jar) all is OK. I don’t have Tomcat error.