Nando Kools

I have the same bug, it happens when you give an effect to other entities as well.

I tried:

    /effect give @e[type=pig,limit=50] glowing

    /effect give @e[type=sheep] glowing

I also can't run 1.15 pre5 with java 10
I'm gonna try with 1.8 now.

edit:
Starting the server with Java 1.8 made it work.

I read somewhere that you needed to use the jre version, I don't know if that's true though.

for those who don't know how, make your batchfile like this:

"%Path_to_java_directory%\java.exe" -Xmx(maximum memory) -Xms(minimum memory) -Xss(set stack size (for 32bit java if i'm not wrong)) -jar ServerFile.jar

In my case, that would be:

"C:\Program Files (x86)\Java\jre1.8.0_121\bin\java.exe" -Xmx1024M -Xms1024M -Xss1m -jar minecraft_server.jar