I have personal experience
I applied for my ILR and my spouse and kid were on Tier 1 Dependent, after my ILR, we went to home country then I returned alone, they returned later and faced no issues while my kid's MN1 was filed before our departure to home country and when I returned, one envelop was of approval in my absence
Later my family again travelled in emergency under same circumstances and there was no issue
so no need to worry, just carry on as normal
Best wishes
Your response has been the most helpful ali_asad_pk, as I was hoping someone who has personal experience could tell me for sure.
I feel more confident now to travel with the kids to pakistan after I getting my ILR and while we await their MN1 to be approved while they have valid PBS-dependant status.
Ayoubtt, your case is very different, but thanks for your response anyway.