Since sh404SEF will not work on Joomla 4 (to the best of my knowledge), I can't be certain what happens when you migrate to J4. If Yannick's new 4SEF extension can carry on with sh404SEF's SEF settings, then I guess you should be fine. But I obviously can't know for sure.
Fotis / JoomlaWorks Support Team
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Please search the forum before posting a new topic :)
