After installing BuffomatClassicTBC-2022.2.3 and BuffomatClassicTBC-2022.2.4 I am unable to use these versions. The mini-map icon is gone and /bom returns "type '/help' for a listing of a few commands" as if the addon were not loaded. However I do see the addon in my list and it is enabled for my character. I tried deleting the addon folder and all my saved variables (assuming pre-ace configs were the problem) with no improvement. I am still able to install and use BuffomatClassicTBC-2022.2.2.

Ran BT/Hyjal and the addon worked fine all night.

Some BugSack data after disabling all other addons (except BuffomatClassicTBC-2022.2.4, BugSack-v9.1.1 and !BugGrabber-v9.1.0):

==========

1x ...uffomatClassicTBC\Ace3\AceEvent-3.0\AceEvent-3.0.lua:13: Cannot find a library instance of "CallbackHandler-1.0".
[string "=[C]"]: in function `error'
[string "@BuffomatClassicTBC\Ace3\LibStub\LibStub.lua"]:23: in function `LibStub'
[string "@BuffomatClassicTBC\Ace3\AceEvent-3.0\AceEvent-3.0.lua"]:13: in main chunk

Locals:
(*temporary) = "Cannot find a library instance of "CallbackHandler-1.0"."

==========

1x ...-3.0\AceConfigRegistry-3.0\AceConfigRegistry-3.0.lua:12: Cannot find a library instance of "CallbackHandler-1.0".
[string "=[C]"]: in function `error'
[string "@BuffomatClassicTBC\Ace3\LibStub\LibStub.lua"]:23: in function `LibStub'
[string "@BuffomatClassicTBC\Ace3\AceConfig-3.0\AceConfigRegistry-3.0\AceConfigRegistry-3.0.lua"]:12: in main chunk

Locals:
(*temporary) = "Cannot find a library instance of "CallbackHandler-1.0"."

==========

1x ...\AceConfig-3.0\AceConfigCmd-3.0\AceConfigCmd-3.0.lua:17: Cannot find a library instance of "AceConfigRegistry-3.0".
[string "=[C]"]: in function `error'
[string "@BuffomatClassicTBC\Ace3\LibStub\LibStub.lua"]:23: in function `LibStub'
[string "@BuffomatClassicTBC\Ace3\AceConfig-3.0\AceConfigCmd-3.0\AceConfigCmd-3.0.lua"]:17: in main chunk

Locals:
(*temporary) = "Cannot find a library instance of "AceConfigRegistry-3.0"."

==========

1x ...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:7: Cannot find a library instance of "AceGUI-3.0".
[string "=[C]"]: in function `error'
[string "@BuffomatClassicTBC\Ace3\LibStub\LibStub.lua"]:23: in function `LibStub'
[string "@BuffomatClassicTBC\Ace3\AceConfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua"]:7: in main chunk

Locals:
(*temporary) = "Cannot find a library instance of "AceGUI-3.0"."

==========

1x ...fomatClassicTBC\Ace3\AceConfig-3.0\AceConfig-3.0.lua:15: Cannot find a library instance of "AceConfigRegistry-3.0".
[string "=[C]"]: in function `error'
[string "@BuffomatClassicTBC\Ace3\LibStub\LibStub.lua"]:23: in function `LibStub'
[string "@BuffomatClassicTBC\Ace3\AceConfig-3.0\AceConfig-3.0.lua"]:15: in main chunk

Locals:
(*temporary) = "Cannot find a library instance of "AceConfigRegistry-3.0"."

==========

1x BuffomatClassicTBC\Src/Buffomat.lua:145: Usage: EmbedLibrary(addon, libname, silent, offset): 'libname' - Cannot find a library instance of "AceEvent-3.0".
[string "=[C]"]: ?
[string "@BuffomatClassicTBC\Ace3\AceAddon-3.0\AceAddon-3.0-13.lua"]:189: in function `EmbedLibrary'
[string "@BuffomatClassicTBC\Ace3\AceAddon-3.0\AceAddon-3.0-13.lua"]:171: in function `EmbedLibraries'
[string "@BuffomatClassicTBC\Ace3\AceAddon-3.0\AceAddon-3.0-13.lua"]:138: in function `NewAddon'
[string "@BuffomatClassicTBC\Src/Buffomat.lua"]:145: in main chunk

Locals:
(*temporary) = "Usage: EmbedLibrary(addon, libname, silent, offset): 'libname' - Cannot find a library instance of "AceEvent-3.0"."

==========

There are a few more but they all terminate in (*temporary) = "attempt to index local 'BOM' (a nil value)". I'm assuming these are just sypmtoms of the previous.

Looks like embeds.xml is missing data? Adding this fixed startup:

<Include file="Ace3\CallbackHandler-1.0\CallbackHandler-1.0.xml"/>
<Include file="Ace3\AceGUI-3.0\AceGUI-3.0.xml"/>

I haven't tried being in a group or raid yet.