Importing entries will delete value in an unimported matrix field

[hongc-cc]

Description

I am importing a csv with only entry_id & category_id.
After import, all imported entries have the matrix field value removed

Steps to reproduce

1. create a csv wtith only entry_id & category_id
2. import (run feed)
3. check the entries

Additional info

• Craft version: 3.5.2
• PHP version: 7.4.8
• Database driver & version: MySQL 5.5.5
• Plugins & versions: 4.2.3

[i-just]

Looks like this has been resolved a while ago. I just tested against 4.4.0 and 5.0.4, and all works as expected - if you import entries and only map entry ID and categories ID and not a matrix field, the matrix field remains untouched. If there was data in the matrix field before the feed was run, it remained unchanged after the feed was run.