I have email notifications enabled globally for all listed events (except for "Comment on subscribed talk page topics" and "Translations", which appear to be recent additions), as well as web notifications. However, over the last month, email notifications appear to have skipped a few events, especially thanking actions, though one undo too.
On the English Wikipedia, while having been notified via web about the following actions (as seen from the screenshots below), the email notifications did not get sent.
* Thanked for [[https://en.wikipedia.org/wiki/Special:Diff/prev/1039119683]], [[https://en.wikipedia.org/wiki/Special:Diff/prev/1039119729]], [[https://en.wikipedia.org/wiki/Special:Diff/prev/1044105183]].
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On Commons, while having been notified via web about the following actions (as seen from the screenshots below), the email notifications did not get sent.
* Thanked for [[https://commons.wikimedia.org/wiki/Special:Diff/prev/586196445]], [[https://commons.wikimedia.org/wiki/Special:Diff/prev/585431053]],
* Undone at [[https://commons.wikimedia.org/wiki/Special:Diff/prev/591530531]].
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