Can't unlock MERGE BLOCK in research tree
Hi team I can't really see if its a bug or something else :
I'm playing a survival mode, "crashed red ship".
Quite advanced in this game, unlocked almost everything but MERGE BLOCK still appear in grey despite the fact all blocks in same raw are all unlocked.
I tried everything I can think of to release it, without success.
- Is there anything special with this scenario about merge block ?
- Could it be a bug?