mafcarvalho Yes, yes, I have everything activated because I actually receive them all as soon as I unlock my phone. They all arrive at the same time.
📱 Nothing Phone (2a) - Nothing OS V3.0-250304-1904 Changelog
Flanagan oh! That seems like you have a power saving setting enabled which is delaying notifications. I suggest you disable Adaptive Battery in case you have it enabled. Reboot your phone after disabling it.
If this doesn’t work try disabling Sleep Standby Optimisation. Both settings are in settings > battery
Flanagan exactly that! Those are the options I suggested. I’m Portuguese so there isn’t that much of a difference 
mafcarvalho So you have those two options disabled and with that all notifications work perfectly even with your phone locked?
Flanagan correct. If this works for you, I suggest trying to enable one of the options to see if it continues working. I’m not 100% sure which one is more critical for notifications delay.
mafcarvalho Well, I have both options disabled and I have restarted the phone but everything remains the same 
After this update, I am facing the following issues:
I am again experiencing network issues. Sometimes, VoLTE and VoNR do not appear for a few seconds, during which I am unable to make or receive calls and messages.
I have enabled the “Power Off Verification” feature, but it is still not working. No PIN or fingerprint is required before powering off the device.
When I try to unlock my phone using the correct finger on the fingerprint sensor, there is no haptic feedback. However, when I use the wrong finger, I do receive haptic feedback.
Let me know if you need further refinements! 
Nothing please fix those issues as soon as possible.
After this update, I am facing the following issues:
I am again experiencing network issues. Sometimes, VoLTE and VoNR do not appear for a few seconds, during which I am unable to make or receive calls and messages.
I have enabled the “Power Off Verification” feature, but it is still not working. No PIN or fingerprint is required before powering off the device.
When I try to unlock my phone using the correct finger on the fingerprint sensor, there is no haptic feedback. However, when I use the wrong finger, I do receive haptic feedback.
Let me know if you need further refinements!
Nothing team, please fix those issues as soon as possible.
Thanks for the informations
- (Edited)
Still just Indian users have update. 
Power Off feutuere only works when the display is locked, and the haptics you need to enable
Merged 2 posts from Experiencing bugs after the latest update..
I didnt get the update, is this update one region only or no?
Furkie only India
Flanagan I’m sorry to hear that. Have you tried to factory reset your phone?
@“Mafcarvalho”#P152424 Yes, it was the last option that the term_0 told me. I think loading the mobile if I receive notifications well
Flanagan well, haven’t you set incorrect bedtime hours by mistake in the clock app? If you get notifications while charging phone battery it looks like your Internet connection is going to sleep with the phone locked. Have you changed anything in Developer Settings? I can’t really think of anything else atm.
mafcarvalho I haven’t consciously changed anything; I just upgraded to OS 3.0 in December. What do you mean? Which option?