On February 29, 2016, the Japanese Language Subcommittee of the Council for Cultural Affairs compiled a guideline on the shapes of the standard kanji, the Jōyō kanji. It says that if the framework of a handwritten character can be recognized, differences in detail should not be judged as errors.
A question-and-answer explanation of the guideline gives an example. The radical tehen, on the left side of many characters, is usually written with a flick at the end of its vertical stroke. Ending the stroke with a stop instead cannot be called an error.