So, accoding to Emilio's investigation, we could fix this if we dispatch `eMouseOver` again [when we restore the temporary removed target](https://searchfox.org/mozilla-central/rev/a965e3c683ecc035dee1de72bd33a8d91b1203ed/dom/events/EventStateManager.cpp#484). However, it's potentilly risy change because it might cause an infinite loop.
Bug 1943411 Comment 29 Edit History
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So, accoding to Emilio's investigation, we could fix this if we dispatch `eMouseOver` again [when we restore the temporary removed target](https://searchfox.org/mozilla-central/rev/a965e3c683ecc035dee1de72bd33a8d91b1203ed/dom/events/EventStateManager.cpp#484). However, it's potentilly risky change because it might cause an infinite loop.