mojang-spigot-remapper fails to remap plugins targeted for Spigot 1.20.5 since it requires Java 21 code. The 1.4.0 release of mojang-spigot-remapper uses an out of date implementation of net.md-5:SpecialSource that doesn't support Java 21 code. The gradle.properties should be update to use the 1.11.4 version of SpecialSource in order to avoid unsupported class file major version 65 errors that prevent remapping.
mojang-spigot-remapper fails to remap plugins targeted for Spigot 1.20.5 since it requires Java 21 code. The 1.4.0 release of mojang-spigot-remapper uses an out of date implementation of net.md-5:SpecialSource that doesn't support Java 21 code. The gradle.properties should be update to use the 1.11.4 version of SpecialSource in order to avoid unsupported class file major version 65 errors that prevent remapping.