Ignore Pricing Rule is read only in Quotation, and not applying even if set to 1 onload

Hi there,

for some reason Ignore Price Rule is not shown in Quotation on new docs:

Or it becomes readonly even if document is in Draft mode:

It is not ignoring even if set to 1 on new document load, see video:

http://recordit.co/DpEUd16mXM

Could you please double check?

erpnext 8.6.4
frappe 8.6.3

Opened an issue as well: