System Information
window 10:
Nvidia Gforce Mx130 with 2 GB VRAM:

Blender Version 2.90

Short description of error

Exact steps for others to reproduce the error
I creating a bons and i put bons in geometry, next i select bons and object to creat a parent and i select option with automatic weights.

Next i add modifier, armatur and i slect bons agen and go to pose mod, so only part of object fallow the bons heave bons wen moving not heave anny part of object fallow the bone, so in all strocture only some bones workly.

I test aply weigth in certnly bons, and same result boject dont fallow the bons, i use auto rrig addon but agen dont work.

im not heave mutche experience if this programe, its pratcly 1 year so i dont know yet if its a bug or not but i suspecting its probably a bug .