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Fingerprint icon often too dim

Star I
Hi everyone!
I have bought a Zenfone 8 flip recently. Great smartphone!
I have the last android 11 release.
I have an issue when I try to unlock display from standby: the icon where to put the finger on is often too dim.... Sometime is impossible to see it.... Sometimes is very clear....
I have noted that it's lighting is not correlate with ambient light, indeed I have also tried to disable the light adjust sensor but no goal.
Does anybody have the same issue?
Thank' a lot!