The walkthrough can help you.
The magician is on the 2nd floor of Fire Dungeon and the tailor is in the forest where you can fight the crocodile and the bear, after Logtown.
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Wizard is in Fire Dungeon's 2nd floor just before the boss and what you call the magicsmith is probably in the cave just when you enter it from the beach. There should be a Anubis character there. You can also checkout the Walkthrough if you have more questions like this.
All the story in the mansion came with the last build. The new build added a new are you go through the underwater. It's been a while, but if it says end of story then that's it for that part of the story.
Edit: I checked the build and you're right, it ends there. I think that was all I had finished up until that point before I had to make the new builds for the public release. The newest build added a new event in Piratetown and a new area you can go through the underwater map. The next build will add the 1st floor of Water Dungeon.
It's not on the docks. You can find the event in the walkthrough. you need to climb through a window. to get to the event, you can see rocks on the ground at the place where you can climb in, next to the building with the bull inside.
You can try to copy the save folder from your old game files (/www) and paste it to the new www folder. There's a chance it won't work. There are also preset saves in the game you can use so you don't have to start from the beginning.
I can't really help you there since I'm not with Joiplay. I don't know what you mean by downloading through Joiplay? The last time I used Joiplay I downloaded the file here on my site using a browser on my phone and then used Joiplay to select that downloaded file, if I remember correctly.
If you found the note in Pine Island Base, he's on the 2nd floor of the town hall, you need to take the open book from the same floor to him to start the questline. (Only in patreon build at the moment 10.24.2023)
If you go to one of the openings here where the light comes (no light in public build yet) you can find spaghetti. it's most likely the one you're missing. You can also use the walkthrough linked on the main page here!
If you're interested, I've already created a comic loosely based on my game. I think I 've made 130+ pages of it already.
I have a folder for them here.