Device: Galaxy A05s (Android 14)
Opera version: (87.2.4607.82902)

Now for my problem.

Opera's Reader Mode cuts some necessary information when Reader Mode is enabled.
Check this post on Android Police
6 features that Android 16 needs to rejuvenate the OS
As you may see, when Reader Mode is enabled, the 5th option, A customizable share menu, is completely hidden, when reader mode is enabled. The whole information, including the necessary ones that Opera's reader mode has cut, are displayed when you disable reader mode.
I suspected this as a bug that slipped the development process of Opera Browser with AI, and needs be fixed immediately, for the benefits of all users of Opera Browser, including me.
I noticed this and probably, other Galaxy A05s users will notice this when using the latest version of Opera browser.
Opera should please, fix this bug, like how they deal with other bugs, because I've known them for taking users' feedback seriously, with implementations being made.