When some users got a block, that block is allowed making edits in user's own talk page. ("Prevent this user from editing his own talk page while blocked" [wpDisableUTEdit] = false)
In above case:
When using PC site, user can make an edits in self talk page,
but when using mobile site, user can't make an any edits in user's own talk page.
I think to should be users can making edits in own talk page when using mobile site. (if above case.)