Yeah, I tried that. Multiple times. When I found out that I could reset my Pixel 3a with the Android Recovery Tool, even if it was bootlooped, then I started experimenting. The process I used worked. The one you outlined did not.File a bug ticket as the wiki describes pls, can help more there.
No clue why that would be - they work for everyone else...
Good to hear!
You shouldn't be flashing 'recovery' - read the wiki pls, you may mess up your device.
Don't do any of this.
Flash stock Android 11, then as per the wiki guide, fastboot flash boot lineage-recovery.img, and then boot to recovery immeadiately.