Describe the bug

in the upgrade tree the players cant unlock external flight mode. the upgrade menu will just close when clicked on

To Reproduce

try to unlock the external flight

Screenshots

No response

Log files

Paste configs or pastebin.com link here!

'/tardis version' output

B 2899

Please just use the existing system upgrades issue instead of opening a new one...

build 2906 this still is happing when unlocking the external flight mode sounds play and the icon changes but dose not save and takes power