I know it's been awhile since you asked but I've just stumbled upon your question here. So, just in case that it might still be relevant, we always recommend the following steps when trying to tackle an issue:

• checking the docs on https://xeokit.io/
• trying to reproduce with https://xeo.vision/ (not relevant here)
• getting support either by contacting us directly (email, Service Desk for customers) or through the xeokit Community on GitHub: https://github.com/xeokit/xeokit-sdk

And in this particular case, you might like to check out this repo which shows different integrations examples of xeokit SDK with other SDKs like Vue, Nuxt, React: https://github.com/xeokit/xeokit-integration-examples