To add to this.

This isn't a bug, it's a feature.

Canvas data gives a lot of datapoints that websites can use to fingerprint your browser. This allows them to track you across multiple sites even if you're blocking ads and pi-holing tracking services.

There is an unavoidable tradeoff between convenience and security/privacy. Privacy features are inherently less convenient than allowing everyone access to everything.

You could disable canvas blocking globally (I'm assuming, I haven't looked) and the problem would go away, but you've then weakened the privacy protections that were built in to the browser.