ASASSN-22ak: very rapid fading!
Josch Hambsch has reported further observations.
Although no definite superhump signal has been detected,
the object suddenly faded by 1.8 mag on Dec. 29
(probably more than 2 mag/d since there was no hint of
fading during Dec. 28 observations).
This fading supports my second interpretation as
an AM CVn star. The object is still expected to be
detectable and please continue observations.