Not sure if it is just me, but using firefox, on an android phone, the delete key refuses to work. I also can’t select text and overtype, and holding to select a word brings up the right click menu.
I rebooted my phone, turned off all assists, auto correction etc. in the gboard keyboard, but still no improvement. It is not the biggest thing, as I would prefer not to use a phone to code, but sometimes we try to improvise.