When restricting a container to specific sites, and opening a link from within that container, the new tab is placed in no container.
Have to look into how MAC implemented it, but I think that can't and probably shouldn't be covered by automatic mode. A workaround that should work is using isolation.
Though, the automatic mode description reads "Tab tries to load a website in no container", so maybe it should be covered after all :D
Related: https://github.com/stoically/temporary-containers/issues/432#issuecomment-650782494
I am using per domain isolation rule as last of rules to catch cases which would land to non-isolated containers:
Domain: *
Always open in: Enabled
Maybe you can try that?
Cheers
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Though, the automatic mode description reads "Tab tries to load a website in no container", so maybe it should be covered after all :D
Related: https://github.com/stoically/temporary-containers/issues/432#issuecomment-650782494