Some versions utilize custom models with literal holes to ensure compatibility with other texture packs stacked beneath it in the resource pack list. Installation Guide for Eaglercraft 1.8.8
If you are looking for this pack to use on a multiplayer server, you should be aware of the risks:
Eaglercraft replicates Java Edition’s behavior using a custom WebGL renderer. Versions newer than 1.8.8 often suffer from performance drops, chunk loading errors, and incompatible rendering pipelines. Version 1.8.8, however, is lightweight, well-documented, and widely supported by server plugins (like AntiXray).