Samesies! I'm on v10.11, Android, on a Samsung S10 with its native OS using Gboard (I think). When I place the cursor before a word and type something new, then hit spacebar, the cursor jumps to the end of the word on which I originally placed the cursor. A fix would be appreciated!
The workaround I have, which is awkward but might help people, is not to place the cursor at the very front of a word, but in front of the previous space before it.