Support of 1.21.3+
All NMS and packet handling code was removed which means the plugin now should work on all versions 1.21.3 and up without any further updates.
Preview multimap arts from bundles
You can now package all pieces of your pixelart into a bundle and rename it to "<any text> <width>x<height>" on anvil. The plugin will recognize such bundle as a big art of multiple pieces and properly display them all.
Keep in mind that the number of pieces in the bundle should match the width x height number. And all pieces should be placed into the bundle in the natural reading order (from left to right).