Joomla 3.9.6 and ChronoForm 6.1.2 - Full save

Dear all,
I just updated both Joomla and Chronoform.
I have a multi language form containing a calendar where label is

{lang:BIRTHDAY}

I'm trying to change designer label (upgrading to 6.1.2 the current designer label was set equals to field label), but neither "Full save" nor "Quick save" save the new designer label I'm tring to set.
​
Is it a bug?
Regards

Designer label is not shown in the View tab.
Changing field label content, the designer label field changes accordingly.
Only "blue" marker is shown, no "Purple" marker for designer label is shown

In my opinion, designer labels are not correctly saved in new 6.1.2 version.
Also, some designer labels are shown in blue instead of in purple
Please, could you check this issue?
Regards