There are some bugs with Izumi content in her flat this time and I think the main reason is a advanced defining of the house actions like done in "GraceHouseActions.rpy". Her 'Controller.rpy' seems to have handling issues when christmas event starts and is spreading those issues.
piano still has some issues when not in x-ray and later when in x-ray.
sleep over at weekend skips time to wednesday.
sleep over during week... she stays in bed till 12:30? without morning shower but still is at work.
At this stage of development, info about release updates in regard to engineering (Izumi's 'AI trader',etc.) would be appreciated.
condo shower = 1 hour and it's penalty table sucks your income.
Grace content at home is without error and I only got two sex options in her shower this time which seems related to your previous choices about forcing sex and sex with her consent. Her love route seems to have been changed to none existent.
For Izumi and Grace an undecided route previous fixed choice seems to be an issue later on.
Most error messages could be ignored but seem to provoke multiple issues for further progress with that char. So, it seems the quest log is an issue. e.g. hacking ability at early stage, usb and the option to talk about with Grace (resist? till which defined time? restaurant talk? she mentioning it at the meeting?) Mentioning the usb stick at the earliest stage, even when on love route with Izumi messes with each and every quest later in game