Steps to reproduce:

1. setp 1: Select in order  Administration -->user group>permissions -->User groups ,add host groups "READ/UES (including subgroups)".  see "screenshot-2019-1106-1"
2. setp2:  Select in order Configuration–host grpups–"READ", selected "Apply permissions and tag filters to all subgroups" and chick to "Update".see "screenshot-2019-1106-2"
3. see "screenshot-2019-1106-3", "User group permission (READ/UES)" lost

On the whole: update 【host grpups–"READ"（Apply permissions and tag filters to all subgroups）】,  Then,the child group, Defined【User group permission (READ/UES)"】is lost.

Result:
See screenshot...

Expected:
Is this normal or a problem? i'm not sure.