To clarify the various dates listed on an Australian permanent residence visa:
Must not arrive after date
You must enter Australia before this date. As long as you enter
Australia before this date you are allowed to be in Australia for the
stay period listed for your visa.
For permanent residents (including resident return visa holders), this
is the date the travel facility of your visa ends. That means if you
depart Australia after this date you will require a Resident Return
Visa (subclass 155 and 157) to re-enter Australia. Departing Australia
without a resident return visa can impact your permanent residency
requirements for citizenship.
Period of stay
Tells you how long you are allowed to stay in Australia on your visa.
Visa expiry date
For permanent visa holders only. If you are:
- Outside Australia, this is the date that your travel facility ends.
You will need to apply for a Resident Return visa if you do not return
to Australia before the expiry date.
Holders of a permanent resident visa, who depart Australia will also
have VEVO show an ‘Expiry’ date. This date is the date the travel
facility is due to end. You will need to apply for a Resident Return
visa if the travel facility date passes while you are outside
My visa lists a 'Must not arrive after date' that is the same as the date after which I need to apply for a resident return visa if I wanted to leave and reenter Australia:
|Date of grant
||20 March 2018
|Must not arrive after
||20 March 2023
|Length of stay
||Indefinite from the date of each arrival
||Unlimited until 20 March 2023. For travel after this date, apply for a Resident Return visa: www.homeaffairs.gov.au/RRV
If your visa lists the same 12 December 2022 date for 'Must not arrive after' and 'Travel' then you might not be eligible for VFTF.
Obtaining a resident return visa would solve your problem. I am not sure whether you are allowed to apply for one before your travel facility ends but it's worth checking out. The immi page for resident return visas lists a processing time of less than one day for most applications.