In the second section, copy the “Personality” line
Immediately paste it (so that it is directly under the first “Personality” line)
Notice that the TAB placement for the “Habits/Mannerisms” line was reset
If you instead hit Enter, Enter, Up-Arrow, Paste then the pasted line will instead have the TABs reset.
This seems to indicate that it isn’t that the paste operation disrupts the TABs on the line under it, it is rather that the paste operation will steal the TABs of the line one line below it.
Yeah, it is stealing the TABs of the line below it.
I had a line without the correct TABs between two empty lines. I took the empty line directly under the target and added TABs where I wanted them. I then took the line with text (and no TABs) and did a cut/paste. Once pasted the line of text had the TABs and the line under it had no TABs.