Mattias explains a problem we recently encountered at Oh Dear with Telescope.

For Oh Dear!, we're using Laravel Telescope as a convenient way of tracking/displaying exceptions, runs, ... It stores its exceptions in the database, so you can easily view them again. It stores those in a TEXT field in MySQL, which is limited to 2^16 bytes, or 65536 bytes. Some of our exceptions tend to be pretty long, and they were hitting this limit.

https://ma.ttias.be/laravel-telescope-data-long-column-content/