Had an issue where I was unable to join my own server due to sequence "base/data/shapes/player" missing for m.dts; removing Glass fixed the issue. This was with a dedicated server where the client im joining the server with is the same that the server is hosted on. I was able to join it fine with an alternate install without glass.
Oddly enough, if I spammed join attempts to my server on the client that got rejected, i would be able to get in after a number of times, only to suffer a runtime error or crash midway through loading.
notably, the console spammed connection dropped errors (iirc error 7 and 3), despite the inital posting to glass server being successful. Earlier today i was able to join my own server with Glass running, and at that time api.blocklandglass.com was connecting fine.