I am presuming you've already restarted NVDA and your computer. If not, try that.
If you have, then take a look at your NVDA dictionaries and, possibly, your synth. I have no issue with the word, "dot," being read when I've got it in a sentence. I'm using NVDA 2020.4, OneCore David. I've got nothing, in any dictionary, that matches on the three characters of the word "dot" in any way, shape, or form.
Brian - Windows 10 Pro, 64-Bit, Version 20H2, Build 19042
Always remember others may hate you but those who hate you don't win unless you hate them. And then you destroy yourself.
~ Richard M. Nixon