macOS partition startup Volume and Recovery Disk type FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF plus part of the disk corrupted? I have a situation very similar to the ones depicted in two previous questions I found (this and this), but still different (I address why my situation is different later on in the question).

The problem

I am really panicking, my computer has been in unbootable status for two days now and because of coronavirus lockdown, in Italy there is no any opened tech shop, at this point I do not know what to do and any help is very much appreciated.

I had a ~50 GB linux partition on the SSD (total ~250 GB) of my 15” Macbook Pro mid-2015.
I created this partition to boot ubuntu back in 2016 and I used it regularly alongside macOS.
About one year ago I updated to Mojave 10.14, and this is the macOS version my computer is running now (I am mentioning it because I suppose that the update changed the file system of my macOS partition to APFS, keeping unmodified the ubuntu partition, I guess).

Today I decided to remove the ubuntu partition, I started the computer on macOS, opened Disk Utility, find the ~50 GB partition assigned to ubuntu on the pie chart, I clicked on the “-“ sign to remove the partition and then “Apply”.
Disk Utility returned to me instantly with an error (not remember exactly the text, but I remember that no error code was given) saying it could not perform the operation, so I googled a bit some solutions (MY COMPUTER WAS PERFECTLY WORKING) and I found a post suggesting to perform some operations from ubuntu, so I decided to restart my computer in order to open ubuntu - I repeat, it was perfectly working, many apps opened and fully working, etc. - and...

It booted into “GNU GRUB version 2.02”

I tried to restart my mac keeping “option” pressed, but it could only find the “EFI Boot” disk (picture attached) which is the one I usually select to boot Ubuntu.
Also, Ubuntu now doesn’t even work anymore, because if I select “EFI Boot” it starts “GNU GRUB version 2.02”.

Now I really started panicking, I don’t care about data of the ~50 GB ubuntu partition, but so foolishly I haven’t backed up the ~200 GB macOS data, and I am just so affectionate to them, I would really like to recover them.

Data Recap


15” Macbook Pro mid-2015
Right now I am booting from the network.
256 GB SSD partitioned in:
~200 GB APFS macOS partition - FileVault encrypted - running Mojave 10.14
~50 GB ubuntu partition - don’t remember the file system (data here doesm’t matter to me)


Photos Attached


diskutil list
gpt -r show /dev/disk1
disk1 information from Disk Utility
Disk Utility overview of the physical disk
booting situation with only the “EFI Boot” partition


Why my situation is different

My situation is different from other questions because of 3 reasons:


The ~50 GB ubuntu partition is disappeared, maybe corrupted, indeed if you add up all the disk's size in diskutil list, you still miss ~50 GB.
I have 2 disks at the same time (index 2 and index 3) that are in the FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF status
When I call gpt -r show /dev/disk1 I don't get any "Suspicious MBR at sector 0" message unlike others users that wrote other questions.


Update 1

I just wanted to confirm that I am booting the mac from Network Recovery and also my Disk Utility version.
Disk Utility Version is: "Version 13 (606)" - "Copyright 2002-2014 Apple Inc.". Is seems, indeed, pretty old.
Try the following commands.

gpt remove -i 2 /dev/disk1
gpt add -i 2 -b 409640 -s 397105928 -t 7C3457EF-0000-11AA-AA11-00306543ECAC /dev/disk1


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