Solved Why does it do this? (sendBlockChange problem)

So basically I'm making an xray plugin for a client of mine and this has me completely stumped. The xray circle is made fine when there is no glass box made around the player. However, no matter how I've implemented the glass box, the xray sphere is then broken.

Without glass box implementation:

https://i.gyazo.com/fdb155e29fcb63138aa5b1c55f823bc4.gif

With glass box implementation:

https://i.gyazo.com/4fb6ea1fd583891c72470ba3cfcdf87a.gif

Here is the code:
https://hastebin.com/adosadenet.cpp

Found the fix with some messing around. Seems that the sendBlockChange blocks basically get messed up when new blocks are being set. Using a delayed scheduler fixes the problem

Code fix:
https://hastebin.com/ezozosajiz.cpp

EDIT by Moderator: merged posts, please use the edit button instead of double posting.