Sorry to hear about your troubles, but am happy to learn that everything is working now.Just successfully used 3.3.0 (started before I noticed that 3.3.1 was just updated), but not without some heartburn...
I had previously used pixel flasher to go from rooted 12.0.0 (SD1A.210817.015.A4, Oct 2021) to
12.1.0 (SP2A.220305.013.A3, Mar 2022) without any problems with version 1.2.0.1
and now 12.1.0 (SP2A.220305.013.A3, Mar 2022) to 12.1.0 (SP2A.220505.002, May 2022)
i have magisk hidden, so i manually did the process on the phone to patch the boot.img
did the dry run and no issues
so then i did "keep data" and flash
and it rebooted my phone, and rebooted and my phone, and oh crap a boot loop
(my kids then walked in from the pool and my wife wanted me to get dinner), so I paused on the unlock warning screen and went to go get dinner - panicking in the back of my mind)
came back hours later and used power+up / power+down to get it to go into bootloader, fastboot, adb sideload, adb rescue mode, googling to see what options I had from there, but most generic google searches came back with going to TWRP to replace X, Y, Z and I knew that wasn't an option....
the annoying thing was I couldn't do anything in adb, b/c it was unauthorized (but all for the better since i didnt mess anything up)
So I was going to see if maybe it was the fastboot current slot, so I changed from A to B, told fastboot to reboot and came back to fastboot, so I was going to reflash a stock march boot.img and see if it would get out of the boot loop. while downloading the factory image, I thought to check pixelflasher (that couldn't see my phone in all the other boot modes (adb sideload, adb rescue mode) and it showed as online?!?
so I clicked flashing thinking it would just give me an error and it all flashed through without a hiccup.
I crossed my fingers while it rebooted that it would get into a boot loop
then it all came up like nothing had happened.
did some app updates, checked the os update and it thought I still needed to update. rebooted and it said it was up to date.
out of an abundance of caution, I always download by photos and files and use swift backup to backup my apps, sms/mms, phone logs, etc. so even if i had to start over, I could get back to where i was, it would just be time consuming....
I have no idea why it bootlooped in the first place after successfully doing the dry run and then why it started to work hours later, but I'm glad it is back. time to go update my old S4 (that had lineage 14 to 19) that I used to google fixes while I at the restaurant waiting for the take out)...
windows 10 pro
pixel flasher 3.3.0
Android Debug Bridge version 1.0.41
Version 33.0.1-8253317
If you could kindly share the support.zip file, I'll take a look and see what exactly happened. That helps immensely.