Yes, it is a problem of Q4OS Trinity desktop, respectively of the app Dolphin Trinity (a special version of Dolphin for Tinity). The problem also exists with other files, for example gnumeric. Opera is perfectly ok 🙂
Unfortunately, there is not really a light Linux that works perfectly. Each uses a different desktop and lacks good developers. It's a pity that people don't join forces and create a single light Linux, with a single desktop, but it works correctly. Diversity is a word that is used a lot at the moment. It means that people get lost in fantasies. Or to put it another way, it's a mess! Hundreds of genders, but only 2 are real. Hundreds of Linux distributions, but only a few work perfectly.