Yes, True Shot is broken, as is the damage portion of Crossbow Expertise, including in the retail version of the game.
With the original GOG version, there was a fix for this, but unfortunately that also introduced a serious new bug, and in fixing that, the skill fixes were reverted. When it came time for the Steam release, the code for the GOG update was lost (missing/damaged backups) and higher resolution support and Win7 compatibility fixes were added again based on the latest available retail version code (code for some of the changes in the retail patches was lost, as well; notably in the updated retail version Finnigan is a decent merchant for survivor type stuff, and after completing his quest you can buy back the magic lockpicks; in the GOG/Steam version, it is better to leave the quest unfinished and keep the lockpicks).