Selling cross-category upgrade without space makes the component disappear with no refund.

[PickledCow]

Example setup in one shop session without leaving.

Buy Enduring Spirit, Extra Health, Extra Regen, Extra Stamina.
Buy Slowing Hex.
Buy Melee Lifesteal.
Sell Slowing Hex.

After this you don't have Enduring Spirit anymore and are 500 souls short still.

Expected behaviour would be to also get a refund on Enduring Spirit.