You can increase the "container open range" - by default it only opens them if they get quite close. Chests should get a (slightly) increased range automatically. But I know I don't have all chests from all acts mapped out yet value-wise - I'm sure I'm still missing some chest SNO's from acts 2-4 (I did try and find as many as I could), so the kind of chest you are talking about might not be listed yet...
You can get me this data if you stand right next to the chest with the bot stopped and click "Dump Ractors" in the Info Dumping tab of demonBuddy and paste the output to me - this will give me the necessary SNO code of the chest so I can make sure it is added. Note that the "Dump Ractors" button is broke in the latest version of DB, so if you have the latest version you'll have to give me a screenshot of the chest and tell me where I can find it so I can try and get that data myself!
(though someone mentioned that if you use the very latest DB, you can avoid the dump ractors not working bug by opening an empty profile/routine in DB, starting the bot, then clicking Dump Ractors - I haven't tried this myself)