Most of the levels in Chronicles are bug free, but....
The 'Red alert' level is well known for many bugs, especially with the Cyborg baddies area's.
One of the worst bugs, being in the location where you hide under a floor grate waiting to capture a cyborg near the gas room area, that never arrives. You wait and wait and wait, then give up
If you are playing on PC or on consoles that allow a lot of saves, then it is best to make multiple saves, by saving regularly in more than one slot.
But there also seems to be a problem if you save in the wrong places you can cause the bugs (nothing easy is there, see Stella guide below)
Stella's walkthough explains all the bugs, highlighted in red, telling you to watch where you save......
http://tombraiders.net/stella/walks/.../redalert.html