What will happen if upgrading barracks with troops in it?

[Staller]

Will the troops inside disappear, stop producing, refund into elixir, or others?

[jdog1123]

Will the troops inside disappear, stop producing, refund into elixir, or others?

once upgraded the troops that were making will resume again. it just pauses the production of them

[jojolopes]

Will the troops inside disappear, stop producing, refund into elixir, or others?

I believe they are just paused in there.

BTW in regards to your sig... SC posted a long time ago that to fix the bug they'd have to rewrite the entire game code, so it will never be fixed and the matter is closed.