Yes, this is an accessibility engine bug. This is covered by [this part of the HTML AAM spec](https://w3c.github.io/html-aam/#att-open-dialog). We should be able to fix this similar to bug 1893707.
Bug 2031407 Comment 6 Edit History
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Yes, this is an accessibility engine bug. This is covered by [this part of the HTML AAM spec](https://w3c.github.io/html-aam/#att-open-dialog).