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We have just installed Rank Math SEO plugin and see both this plugin and our plugin use CMB2 Metabox fields library.
Rank Math plugin customized CSS of Switch Button Field Type: https://github.com/FocuxTheme/CMB2-Switch-Button
We see CSS is changed from their plugin but we see it still working fine.
I contacted the Rank Math team. Their findings apparently revealed that your video plugin is using a version of CMB2 from January 2020 which is outdated and is causing a compatibility issue with Rank Math Author settings under Titles and Meta.
The Rank Math Author settings usually have many options but whenever the Haru video plugin is enabled, only one switch button is displayed in Rank Math Author settings under Titles and Meta.