Design loses font style link from time to time

We have a Figma file specifically for font styles, and we publish this file as font style source for all design files in the company.

Issue: in many design files, designers find font loses styles sometimes.
from this (we want this):
image
to this (we DO NOT want this):
image

Generally our designers need to spend many hours per week just to relink all the font with styles if they find any that loses the link.

We need help, like a lot of help for this.

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