Subler corrupts chapter titles and preview images for movies that run longer than 2 hours

I just noticed this recently after using Subler for many years.

After editing the metadata tags and optimising the movie I noticed that the chapter titles and images where missing around and after the 2 hour mark. Hence I'm getting 2 hour plus movies that have been re-tagged and with half the chapter markers, manually adding chapter titles brings back the chapter however the preview images are missing or corrupts them.

Having a look at my previous files it seems this has been happening for quite some time.

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