I also confirm that the problem appears after an upgrade to 10.4.x and is not present in 10.3.11 I've got other sites with other themes and there is no problem with those sites.
I confirm also that it is only for anonymous... well, all the symptoms described in
#4
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Update to Drupal 10.4.0 breaks responsive menu
Active
and
#5
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Update to Drupal 10.4.0 breaks responsive menu
Active
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