New line disappaeras

[PracticalBot]

Since some days I have a problem while editing text the newline to the last paragraph disappears.
This could come from a new version of firefox (i will test other browsers later today); it is happening here and in other xenforo forums.

To repeat error
Press two times carriage return, before starting the next word, then write three chars and delete the last char ... ups, the char disappears and also one carriage return above the new line.

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