[2.0.4] Linux: remove hotkey then add hotkey fails

[skeets]

Note that this same exact test when run in Windows Sikuli 2.0.4 works as expected. In other words, when I remove the hotkey then add the same hotkey back, the add hotkey return value is True (success) and not False like Linux Sikuli 2.0.4 (see below). Also note the [debug] statements. When a clean add or remove is done it doesn't always print out the [debug] statement (for example: "[debug] HotkeyManager: add Hotkey: "). Seems like it only prints out the first time a hotkey is added or removed.

Snippet from Sikuli startup:
SIKULIX_HOME in environment specified as /home/username/SIKULI_MAIN/sikuli2.0.4
running SikuliX: -Xmx512M -Dfile.encoding=UTF-8 -Dsikuli.FromCommandLine
-jar /home/username/SIKULI_MAIN/sikuli2.0.4/sikulix.jar -d 3 -r /home/username/SIKULI_MAIN/Sikuli.Main.sikuli
java -Xmx512M -Dfile.encoding=UTF-8 -Dsikuli.FromCommandLine -jar /home/username/SIKULI_MAIN/sikuli2.0.4/sikulix.jar -d 3 -r /home/username/SIKULI_MAIN/Sikuli.Main.sikuli
[debug] RunTime:temp folder ok: /tmp/Sikulix_567464275
Options: *** options dump
Options: testing =
Options: OptionsFile = /home/username/.Sikulix/SikulixStore/SikulixOptions.txt
Options: *** options dump end
***** show environment for 2.0.4-2020-03-14_08:01 API
user.home: /home/username
user.dir (work dir): /home/username/sikuli
user.name: username
java.io.tmpdir: /tmp
running 64Bit(amd64) on l (5.4.0-104-generic) from a jar
java 11 version 11 vm 11.0.14+9-Ubuntu-0ubuntu2.20.04 class 55.0 arch 64
app data folder: /home/username/.Sikulix
executing jar: /home/username/SIKULI_MAIN/sikuli2.0.4/sikulix.jar
*** classpath dump sikulix
  0: /home/username/SIKULI_MAIN/sikuli2.0.4/sikulix.jar
  1: /home/username/.Sikulix/Extensions/jython-standalone-2.7.1.jar

Hotkey test output:
[user (3/27/22, 10:20:14 AM)] **DEBUG** In registerExitHotkey:
[debug] HotkeyManager: add Hotkey: CTRL+ALT F5 (116, 10)
[debug] HotkeyManager: add Hotkey: CTRL+ALT+SHIFT F5 (116, 11)
windowsHotKeyRegRtnVal: True
linuxHotKeyRegRtnVal: True

[user (3/27/22, 9:54:29 AM)] **DEBUG** In registerPauseHotkey:
windowsHotKeyRegRtnVal: True
linuxHotKeyRegRtnVal: True

[user (3/27/22, 10:02:27 AM)] **DEBUG** In unregisterPauseHotkey:
[debug] HotkeyManager: remove Hotkey: CTRL+ALT F7 (118, 10)
[debug] HotkeyManager: remove Hotkey: CTRL+ALT+SHIFT F7 (118, 11)
windowsHotKeyUnRegRtnVal: True
linuxHotKeyUnRegRtnVal: True

[user (3/27/22, 10:02:35 AM)] **DEBUG** In registerPauseHotkey:
[error] HotkeyManager: addHotkey: failed to remove already defined hotkey
[error] HotkeyManager: addHotkey: failed to remove already defined hotkey
windowsHotKeyRegRtnVal: False
linuxHotKeyRegRtnVal: False

[user (3/27/22, 10:07:55 AM)] **DEBUG** In unregisterPauseHotkey:
[error] HotkeyManager: removeHotkey: failed
[error] HotkeyManager: removeHotkey: failed
windowsHotKeyUnRegRtnVal: False
linuxHotKeyUnRegRtnVal: False

[user (3/27/22, 10:20:14 AM)] **DEBUG** In unregisterExitHotkey:
windowsHotKeyRegRtnVal: True
linuxHotKeyRegRtnVal: True