after updating Sydney Pro from version 2.0.28 to 2.1.2, the submenus in the main menu no longer open (click or Mouse over). This behavior only occurs with Firefox 78.10.1esr (Windows 10).
Non-esr versions of Firefox, as well as Chrome, Opera and Edge do not exhibit this behavior.
Is there a workaround, or a clue as to what is causing this behavior?
Reproducible, even if all plugins are disabled, no custom changes have been made to the source code.
Wordpress 5.7.1, Windows 10, https://staging.neusta-inspire.de/