migration tools fail to export some of my stacks

[freeeflyer]

If I list the stacks i get that :

$ rancher stacks
ID        NAME               STATE       CATALOG                          SERVICES   SYSTEM    DETAIL    AVAILABLE UPGRADES
1st13     tooling            healthy                                      1          false               
1st15     cowcheck           healthy     catalog://community:cowcheck:0   1          false               
1st17     AppUpgradeServer   healthy                                      1          false               
1st20     LoadBalancing      healthy                                      3          false               
1st21     TestRancher2       healthy                                      1          false               
1st27     Twiing-staging     healthy                                      8          false               
1st29     Admin              healthy                                      1          false               
1st30     database-backend   healthy                                      1          false               
1st31     bred-staging       healthy                                      3          false               
1st39     Mail               unhealthy                                    2          false               
1st41     LetsEncrypt        unhealthy                                    1          false      

When I export I get:

$ migration-tools export -a --url http://10.x.x.x --access-key xxxxxxxxxxxxxxxxxx --secret-key xxxxxxxxxxxxxxxx --export-dir ./staging
INFO[2019-01-17 11:29:47] ---Starting migration helper tool export command--- 
INFO[2019-01-17 11:29:47] ---Exported docker compose files for 6 stacks from 1 environment(s) on ./staging directory--- 
INFO[2019-01-17 11:29:47] ---Please check README.md file for Rancher 1.6 to Rancher 2.x organizational changes--- 
$ ll staging/staging/
total 32
drwxr-xr-x 8 nicolas nicolas 4096 janv. 17 11:29 ./
drwxr-xr-x 3 nicolas nicolas 4096 janv. 17 11:29 ../
drwxr-xr-x 2 nicolas nicolas 4096 janv. 17 11:29 Admin/
drwxr-xr-x 2 nicolas nicolas 4096 janv. 17 11:29 AppUpgradeServer/
drwxr-xr-x 2 nicolas nicolas 4096 janv. 17 11:29 cowcheck/
drwxr-xr-x 2 nicolas nicolas 4096 janv. 17 11:29 LetsEncrypt/
drwxr-xr-x 2 nicolas nicolas 4096 janv. 17 11:29 LoadBalancing/
drwxr-xr-x 2 nicolas nicolas 4096 janv. 17 11:29 Mail/

some of them are missing..

[superseb]

Can you share View from API for the stack that is missing

[freeeflyer]

Installed 0.12 the problem seems fixed.