[Bug] - SimplePlugin - Foreign Key attribute values are not (always) being updated or deleted.

Description

Foreign Key attribute values are not (always) being updated or deleted.

Distribution Name and Version

Debian 11

FusionDirectory Version

1.4-dev

PHP version used

7.4.30

Origin of php packages

From distribution

Steps to Reproduce

The problem was found during the update and deletion of Code Population elements. User being defined with specific Code Population would not see their codes being updated or deleted when changed by the configuration page of supann Code Population (supannEx - FD backend configuration).

Expected behavior:

Upon modification of a reference element, both main and foreign element are updated.

Actual behavior:

Reference exists, but values are not updated or deleted.

Reproduces how often:

100%

Additional Information

None.