If you go to connected devices, Smart cover, what does it show you?No, I don't think I have any other magnets attached.
I'm just using an authentic S-View phone case from Samsung.
While the clock face doesn't show up when I close the lid of the flip case,
In the Settings app:
Apps & notifications -> Notifications -> Notification history
Recently dismissed -> FlipFlap: Smart cover detected
and this latter has the correct timestamp matching the time when I closed the lid.
I can also hear a phone ring upon closing the lid when sound is turned on.
For the record, I have another phone with LineageOS 18.1 installed, namely LG G3, which also makes use of FlipFlap for almost similar functionality: the circle area of its flip case should show a clock face upon closing its lid.
Here too, this used to work properly with stock firmaware, but not anymore once LineageOS was insatlled.
Regarding this, the maintainer of LineageOS for LG G3 model kindly answered to my inquiry yesterday: he said he in person is using an authentic quick circle case for LG G3 phone and confirmed that it is working very well.
So now I suspect somes OS settings I make out of habit is preventing FlipFlap from functioning correctly, but I have trouble narrowing it down.