Comments can't display under documents though linked already

Hi

In my modules like Sales Order or Stocks which enabled workflow, we had issue on list all comments created by workflow action which already linked.
that means activity information like who approved what or workflow state changed to what can’t display under the related documents, but are already linked correctly. Those things only happened after migrate to v13.x
Please give me advise how to fix.

For example, in my Material Request, one comment already linked to one of my MR doc


But we can’t see that comment in doc MAT-MR-2021-00029
most of issues are related workflow comments, comments like who edit/change what in doc record correctly all the time.

Thank you