Entry with crossref does not update immediately

[SuXiChangZhen]

JabRef 5.2--2020-12-24--6a2a512
Windows 10 10.0 amd64
Java 14.0.2

• Mandatory: I have tested the latest development version from http://builds.jabref.org/main and the problem persists

put the discussion #7057 here. If the field of the entry does not set, and the entry has a crossref, the preview will use the field of crossref entry. However, when change the field in crossref entry, it will only be updated in the crossref entry column.
Steps to reproduce the behavior:

1. create an entry a with some information
2. create an entry b and crossref a(b shows a's information in the table)
3. change the field of a(e.g. Year)
4. In the table, b's year field does not be changed

The screenshot can be found in #7057

Log File

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[SuXiChangZhen]

From my current debug, it may because the crossref entry does not inform its child entry to update when its field changes. So I add the crossref entry's observable values to child entry and the problem seems be fixed. I am not sure if it is an appropriate solution.