1.2 PureTech Engine situation

I’m in the market for a family/adventure car, and the Toyota Proace City Verso has caught our attention.

The only thing giving me doubts about the Proace City Verso is some chatter I’ve come across about potential reliability issues with its 1.2 PureTech petrol engine. From what I’ve read, this engine is produced by Stellantis. I know nothing about engines (or cars), so I hope someone could shed some light on this issue. Also, sorry that I have no more details about the engine. Only thing I know is, it is the petrol engine in the latest version of this car.

• Are these concerns about the engine legitimate, or are they overblown?
• Does anyone know if the supposed issues have been addressed in the latest models? I read somewhere that the timing belt has been replaced with a chain.