Ergh dratted thin bits! Thanks for letting me know, I'll try to fix that up (if someone doesn't beat me to it) when I have another moment.
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Published using OSMCha: https://osmcha.org/changesets/176656662

I'm so sorry, my learning experiments are causing a lot of problems for you aren't they ^_^; I otherwise don't know what should be done with this door, it just connects to a room (or at least was supposed to, if it got flagged as almost junction I'm guessing something didn't connect). Are rooms not routable?
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Published using OSMCha: https://osmcha.org/changesets/163112022

The noexit is a door (or should have been tagged as a door) into the building and is connected by internal corridor to a door on the other side. I did note it's an isolated route (didn't get the warning probably because it's an internal corridor) and connected the doors to the surrounding footpaths if that helps, or does it need something else done to fix it?
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Published using OSMCha: https://osmcha.org/changesets/162909777

It's still visible on aerial, maybe mark it as a recently demolished building (it's a thing in the id editor, the tag is demolished:building=yes) so some industrious soul (such as myself ^_^;) doesn't helpfully re-add it?
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Published using OSMCha: https://osmcha.org/changesets/162764155

No worries at all, I am pretty sure I interpolated those ones, if you surveyed them yours would be correct. Nice to see someone else in the area!

Thank you for fixing it and for the link! I really should have figured there would be a demolished tag.

Thanks! And thanks for fixing the residential and commercial areas, at this stage I'm too scared to touch anything larger than a big building (and even that's scary).

Thanks for the tip! I'll try that and to also slow down as I have been using the square corners thing from the right click menu but might not be hitting it as much as I think I am.