Makes me feel awful when people start giving advice here even though they haven’t faced this thing in their car, aur phir tappet walay mashwaray aur tuning walay mashwaray, thori dair tak mota oil 20w50 wali awaam bhi ajaye gi.
It used to happen in my 2016 corolla altis 1.8 cvti, sounds like tick tick tick for a second, right?
Common issue of dual vvti acutator in zrfe series engine. Well, in my case it was reduced or vanished by changing engine oil from Toyota oils to liqui moly.
I would suggest you to pour liqui moly 5w40 synthoil hightech (fully synthetic) with ceratec additive, and this sound will reduce and it will vanish after second oil change in between 8-10 thousand kilometers. Also, Always start cold engine after keeping key at ignition for like 3 seconds.
Note: it’s not a problem at all, it happens due to wrong choice of engine oil.