Demo: http://www.byond.com/members/tenkuu/files/src/ cropdemo_src.zip

Under TILED_ICON_MAP Crop() and Scale() don't preserve an icon's delay. It is properly preserved when using TOPDOWN_MAP.

The demo will create two icons. The first icon just creates a baseline icon. It works properly under either map_format, the delay is the same for the .dmi and the dynamic icon. The second icon is scaled up to 96x96. Notice under TILED_ICON_MAP the delay is set to 1 for both frames, but under TOPDOWN_MAP, it properly keeps the delay at 4 for both frames.