Unfortunately, I still need to stick to spigot 1.8.8. We currently try to update to Java 14, which is not supported by spigot 1.8.8 because the netty version is incompatible.
After updating the bundled Netty version to 4.1.49 (yeah, I know it's hacky af), I realized that ProtocolLib was not working anymore ("Unable to find NetworkManager in .."). Thus, I added a delay of the injection if a newer Netty version is present.
Injection is forced to be delayed since Minecraft 1.12+. This has been hotfixed in https://github.com/dmulloy2/ProtocolLib/commit/b4f9c501b3dd33ff740b917c6ba83cfb99977e61.
Unfortunately, I still need to stick to spigot 1.8.8. We currently try to update to Java 14, which is not supported by spigot 1.8.8 because the netty version is incompatible. After updating the bundled Netty version to 4.1.49 (yeah, I know it's hacky af), I realized that ProtocolLib was not working anymore ("Unable to find NetworkManager in .."). Thus, I added a delay of the injection if a newer Netty version is present.