Murray Leinster's "Planet of Dread" (novelette, free): Adventure on a world of giant insects & fungi
May be I've read too much of the series. It's readable & fast moving - among my faster finishes of a story of this length. But it's very pulpy & with sensibilities of a different era.
Story summary.With mankind spanning the galaxy, a group of revolutionaries escape their world, & intend to lie low elsewhere for a while. During a port, their ship is hijacked by a local fugitive - the hero of the story who's eventually overpowered. For complicated reasons, they land of an uninhabited world to maroon the hijacker - only this world turns out to be a forgotten & unfinished terraforming job of mankind, & a nightmare world now.
They'll have adventure there, & strike treasure left by a shipwreck 150 years old, & finally all will end well.