bulkCreate with included model and individualHooks: true creates included models twice

Issue Creation Checklist

• I have read the contribution guidelines

Bug Description

SSCCE

I couldn't get the https://github.com/papb/sequelize-sscce to run, so I created my own repo:

Here is the link to the SSCCE for this issue: link

What do you expect to happen?

When calling bulkCreate on a model with include (I only tested hasMany association) and individualHooks: true, I expect included models to be created once.

What is actually happening?

As demonstrated in the SSCCE, a ValidationError is thrown because sequelize tries to create the included models twice with the same id.

Environment

• Sequelize version: 6.9.0
• Node.js version: 14.18.0

Bug Report Checklist

How does this problem relate to dialects?

• I think this problem happens regardless of the dialect.
• I think this problem happens only for the following dialect(s):
• I don't know, I was using postgres, with connector library version pg@8.7.1 and database version 13.4

Would you be willing to resolve this issue by submitting a Pull Request?

• Yes, I have the time and I know how to start.
• Yes, I have the time but I don't know how to start, I would need guidance.
• No, I don't have the time, although I believe I could do it if I had the time...
• No, I don't have the time and I wouldn't even know how to start.

Start by running the linked SSCCE repository with Sequelize 6.9.0, Node.js 14.18.0, PostgreSQL, and individualHooks enabled. Trace the bulkCreate call with its included hasMany model and add a regression test showing that the included records are created once. Done means the duplicate creation and resulting ValidationError no longer occur.