Did you find a solution already?
I have the same problem: althoug I've set a module only to be displayed on the homepage, it still appears on the page of a JEM-event.
The strange thing is: I updated from Joomla3 to Joomla4. The pages with events that were already in Joomla3 do not show the module, but when I make a new event in Joomla4, it does.
Unfortunate not. I adjusted the layout a bit so it more clear to the users of the site. Would be nice if this issue can be solved, but I did not hear anything after mentioning that the modules are set-up correctly with show on specific pages only.
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