I edited the Notes field for this (Russian) sentence:
Обе мои сестры замужем.
The first time I did it, I saved it with an incorrect pronunciation in the field, namely сёстры. I then realized my mistake and tried to change it to сестры́ at the end of the round. But it wouldn’t let me save the record. It kept showing the dialog “Oh no! There was an error saving the sentence. Sorry about that. Please try again and let us know if you see this message again.”