Reproduction:

• Stand next to a wall of glass panes
• Logout and back in
• Player will have teleported to the other side of the panes or, potentially, to a location near the spawn point but high enough in the air to potentially cause death.

Screenshots from two runs depicting both scenarios are attached.

Container log:

Executing server
NO LOG FILE! - setting up server logging...
NO LOG FILE! - [2018-12-28 05:27:39 INFO] Starting Server
NO LOG FILE! - [2018-12-28 05:27:39 INFO] Version 1.8.0.24
[2018-12-28 05:27:39 INFO] Level Name: BedrockServer
[2018-12-28 05:27:39 INFO] Game mode: 0 Survival
[2018-12-28 05:27:39 INFO] Difficulty: 3 HARD
[2018-12-28 05:27:40 INFO] IPv4 supported, port: 16821
[2018-12-28 05:27:40 INFO] IPv6 not supported
[2018-12-28 05:27:41 INFO] Server started.
...
[2018-12-28 22:11:08 INFO] Player connected: <me>
[2018-12-28 22:11:27 INFO] Player connected: <me>
[2018-12-28 22:11:57 INFO] Player disconnected: <me>
[2018-12-28 22:12:02 INFO] Player connected: <me>
[2018-12-28 22:21:37 INFO] Player disconnected: <me>
[2018-12-28 22:21:42 INFO] Player connected: <me>
[2018-12-28 22:23:09 INFO] Player disconnected: <me>