The patch pack only adds textures for extra mods. It relies on the main Squareful pack for everything else, so both packs must be active and in the right order.
Enable the main pack first
1. Make sure the main Squareful pack and the patch pack are both in your resourcepacks folder.
2. From the title screen or pause menu, open Options > Resource Packs.
3. In the Available list on the left, find the main Squareful pack and click its arrow. It moves to the Selected list on the right.
4. Only after the main pack is selected, find Squareful Shrimp's Patch Resource Pack and move it across too.
Check the stacking order
In the Selected list, packs higher up override packs lower down. A newly added pack normally lands at the top, so enabling the main pack first usually gives the right order. Check that the list looks like this, from top to bottom:
- Squareful Shrimp's Patch Resource Pack
- Main Squareful pack
- Default
If the order is wrong, hover over a pack and use its up or down arrows to fix it.
When you return to your world, modded machines and materials should match the clean, blocky style of your vanilla blocks.