PC Very odd behavior when attempting to create a very large snapshot

HydroPage

Terrarian
Steam or GOG
Steam
Single Player/Multiplayer
Both
Operating System
Windows 10
Terraria Version
1.4.1.2
Controls Used
Keyboard/Mouse
I was experimenting with the snapshot feature on the big map, and I was curious to set the frame to the entire world and seeing what would happen. It's a lot to describe, so I have filmed and thoroughly replicated the bug. My first attempt at doing this, terraria crashed, with a title screen message "Bad header caused buffer overflow", and presenting me with this stack trace for you guys:
Terraria Bug StackTrace.png


My second attempt created the image, but I don't believe this is what I would expect:
Capture 2021-01-10 19_32_18.png


My third attempt, seen in the video, shows a different image, and a step by step replication:

Note that the steps above were conducted in a "Host & Play" server. I attempted to do this in Single Player mode, and it caused the crash report seen above on three tries consistently, when the former caused the crash on the first try, and the strange bugs depicted on consecutive tests.

UPDATE DETAIL: The NPCs are totally fine. This is only happening on the map. If I go and actually visit the NPCs, they are just fine, and their map icons stop phasing
 
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