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

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

Steps to reproduce the behavior:

1. Add online source to library (BiBlaTeX mode on, I couldn't find online or electronic on the default mode)
2. Add urldate using calendar selector
3. Export selected items to MS Word format
4. Import to MS Word, YearAccessed, MonthAccessed, DayAccessed are all empty and I have to manually input the date

I notice in the exported XML, the date I chose earlier is nowhere to be found, so it must be an Export issue.