I've followed the instruction on how to create a mapping file Work Items to do a migration from TFVC to Git. The migration is done in the same team project while maintaining connection with Work Items.

I've generated a mapping file like this one

1|1
2|2
3|3
4|4
5|5
6|6
7|7
8|8
9|9
10|10
11|11
12|12
..

I've created this file until 100.000 then cloned everything with commandline

git-tfs clone http://tfs.cyberpunk.local:8080/tfs/ExperimentalCollection $/TFVCMigration/Main migration1 --branches=all --export --export-work-item-mapping="c:\temp\gittfs\mapping.txt"

The result is quite good, but some of the work items are not mapped.

For other commit everything is ok, I see the #WorkitemId syntax and it will be associated during a push.

What could be the reason?

It would be nice to use #WorkItemId syntax even in the Notes part to avoid this issue.