So, here's what was happening: There is no Day 4 content in build 0.2.
When we released Luna Lake, Build 0.1 was released here first, and 0.2 released on Patreon. The differences between these builds was the cliff-hanger and end o day contents.
0.1 had a Cliff Hanger. Once Joshua sees you, there's a loud 'boom' and the game ends. 0.2, this doesn't happen, and instead you play through the whole of Joshua's route on Day 3. Once Day 3 ends, the credits starts.
Only build 0.3 started having Day 4 content. (And 0.3 is already available to download for the public, while Patrons have access to 0.7 and later this month, 0.8).
However never forget: If you play through older builds and load saves on newer ones, bugs can occur. When it happens, always play through the game again instead just to be sure.