I have gotten a few reports of cases from WCS users where certain parts of the skills would not work.
These skills were working for me when I tested them. Today I updated my Emulator to the most recent version and I am now experiencing the same issue as the other users.

It turns out, that using es_delayed followed by a command will cause that command to not be executed.
But if you do es_delayed followed by es and then followed by the command, then the command will be executed.
Although this doesn't seem to apply to certain built-in eventscripts commands, this seems to break a lot of custom commands outside of eventscripts.

This is of course not ideal, but it apparently has been like this for a long time. But it hasn't been as noticeable because in the past it has been this way but only when executing the commands through the server console.
But with the change you made the 10th of April this year, it changed it around so the problem wasn't occurring in the server console anymore, however, it instead started occurring in every script. Meaning that all scripts using es_delayed would need to be changed to es_delayed es instead in order for them to be executed.

The change I'm referring to is one:
3f326be

I have changed my own server's addons/source-python/plugins/es_emulator/eventscripts/esc/cmds/run.py back to what it was prior to the update as seen below:

import gamethread, esc
from gamethread import queue, delayed
from .. import stack
from ..val import sv, FLOAT, VAR
from . import Command
import es

@Command(syntax='<variable>', types=VAR, desc='Just runs a command-string inside of the variable.')
def commandv(argv):
  stack.insertrawline(sv(argv[0]))
  
@Command(argsfrom=2, syntax='<seconds> <commandstring>', types=FLOAT, desc='Will run <commandstring>, after <seconds> seconds.')
def delayed(argv, args):
  gamethread.delayed(argv[0], stack.queueline, (argv[1], argv[2:], args, esc.stack.currentblock, True))

@Command(syntax='<commandstring>', desc='Adds a command to the end of the command queue.')
def soon(argv, args):
  queue(stack.queueline, (argv[0], argv[1:], args, esc.stack.currentblock, True))

@Command(syntax='<file>', desc='Runs an exec file from memory.')
def old_mexec(argv):
  es.old_mexec(*argv)

This does mean that I cannot use es_delayed without adding an additional es to the console when I wish to do some testing that involves delays, but the alternative is that a lot of scripts will break, which will affect every player on the servers.
So, in my opinion, this is definitely the lesser of two evils, and I would recommend changing it back to this as well, at last until a full fix is found, as it is far less damaging.

I am running the newest version of Source-Python, and the Emulator and Warcraft-Source.

--------------------------------------------------------
Checksum      : 3a539eb78239fc93f8f6f382d3c397df
Date          : 2020-08-01 12:18:11.622719
OS            : Linux-4.15.0-88-generic-x86_64-with-debian-stretch-sid
Game          : csgo
SP version    : 699
Github commit : 7e06ce8e445e17425dfcecdad5895473c294fabc
Server plugins:
   00: Source.Python, (C) 2012-2020, Source.Python Team.
   01: Metamod:Source 1.10.7-dev
SP plugins:
   00: es_emulator, https://github.com/Ayuto/EventScripts-Emulator
   01: es_emulator_events
   02: wcs, 2020.07.31-4, https://forums.sourcepython.com/viewtopic.php?f=7&t=1925
   03: commandsx
--------------------------------------------------------