TZUTC: -0800
MSGID: 58841.sync_sys@1:103/705 2d7c0fea
PID: Synchronet 3.21a-Linux master/88b423313 Sep 29 2025 GCC 12.2.0
TID: SBBSecho 3.31-Linux master/d39e01091 Nov 03 2025 GCC 12.2.0
BBSID: VERT
CHRS: ASCII 1
FORMAT: flowed
https://gitlab.synchro.net/main/sbbs/-/issues/1007#note_7875

A better check might be `if(attr !== undefined)`? Or maybe a comparison with
the existing attr to see if they're different?

```
if(attr !== undefined && properties.data[x + position.offset.x][y +
position.offset.y].attr != attr)
	properties.data[x + position.offset.x][y + position.offset.y].attr = attr;
```
?
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