Not a guide and more of a heads up for Tatooine
Mos Eisley: I had an issue where I was stuck at 31/33 Kyber bricks and it turns out there's a secret side quest (which isn't in the side quest or puzzles tab) and it's for making the 5 people in the cantina dance with Jedi mind tricks and it will award the last 2 bricks for anyone stuck where to find them
Mos Espa: there's a sorta similar thing here people are getting stuck with but there's a side quest from Watto inside his workshop which has easily been missed by people.
Jundland Wastes: I was missing about 7 or 8 characters and a couple bricks turns out there's a series of side quests which are only unlocked by completing a side quest on jakku which involves 2 storm troopers also completing the thief mission Kyber brick on naboo unlocks a new Kyber brick back on jundland
Once you have no more markers with your collectible detector make sure you got to your rumour page and check there for what your missing as it helped me a lot when nothing else was on the map but I was still missing things
Another thing to note is there's a lot of visual bugs in the game so some icons and bricks may still be on your map but nothing is there if so just restart your game and they should go away
Hope this helps