Auditlog: related fields not referenced when rule is applied to a model

[VizMan0616]

Describe the bug

When auditlog applies a rule to a model, if it contains a related field referencing a value from another model or a parent model (Such a lines) if accessed is treat as empty or is not referenced at all resulting in an unexpected behavior even if the parent field or the other model itself containing the value does have it.

I.e: If ModelA have the 'company_id' field and I want to send it to their child `ModelB' through a related field, when accessing to such field on the ir child on a action or a compute is treated as empty.

Following the previous example in the image below, when accessing the 'currency_id.round' of the child model (the parent being withholding_iva_id) which in this case is a related, is comes as empty resulting in an ValueError: Expected singleton: res.currency()

To Reproduce

Affected versions: 16.0, 17.0, 18.0

Additional context
One thing I've noticed is from the PR (#3373) and onward is when the rules break such behavior. On the version 17.1.0.5 does not happen at all

[StefanRijnhart]

Possibly fixed by #3469, but it's difficult to say without a traceback. Please test with 18.0, post the traceback and the minor version of the auditlog module that you were using. If it is solved in 18.0 but not in earlier versions, we may need to backport #3469.