Hi Jedon,
Greetings from Syncfusion.
We have ensured your reported scenario with latest NuGet
package version 20.4.0.40 in Blazor WebAssembly. Chart control is
rendered fine without any exception. We have attached the tested sample and
screenshot for your reference.

Sample : https://www.syncfusion.com/downloads/support/directtrac/general/ze/Chart20.4.4092018473.zip
If you are still facing problem, please try to replicate an
issue in above sample or share us issue reproduced sample to validate this case
further from our end. Please confirm us whether you have done any other
customization is your sample. Kindly revert us if you have any concerns.
Regards,
Durga Gopalakrishnan.