I have a large command block creations world, and I've been lately trying to change the commands to the 1.13 command format. The very first project I tried to create did not work. I tried to change the command in multiple ways, and tested it in the chat. For some reason, the repeating command block did not work. The command did work in chat. Here is the command:

/execute at @e[type=slime,distance=..5] run execute at @e[distance=..2] run tp @s ~ ~5 ~

The command is meant to make the slime teleport any entity in a radius of 2 blocks 5 blocks up. Is there any problem? The command only didn't work in the always active unconditional repeating command block. When I ran it in chat it worked just fine. According to what I have seen, the command block simply does not work. I am 99% sure this is a bug.