The aviation safety database is using the Mosquito loss list as its source, so any error in the latter source will be repeated in the former. As a regular contributor to this database, that is open to everybody, I can tell you that it is not 100% reliable, more close to Wikipedia standard. I delete/correct entries daily.
I can confirm you from a local history booklet that a Mosquito crashed on 19 September 1944. I resume/translated the story below:
On 19 September at 4 pm a Mosquito flying on the desk crash-landed in the cabbage field at the place called La Chapelle des Marais, near the village of Langatre. An inhabitant, Armand Moyon, ran to help the airmen (Lt Woodruff and Moncur) and hide them under a tree. Germans arrived soon after with dogs but did not find them.
The next days, the members of the Resistance inside the German pocket of Saint-Nazaire continued to help them and enabled them to evade capture and reach the Allied lines.
http://www.musee-resistance-chateaub...eStNazaire.pdf.
No serial given.
More in English there:
https://33squadron.wordpress.com/
The village of Langrate is in the commune of Herbignac (you have a typo in your Herbinac)