Myriad Tables Scripts run in SD but not SE

Anybody else seeing this error:
“The bundle “SMSTableDialogBuilder” couldn’t be loaded because it is damaged or missing necessary resources.” number -4960 from framework “SMSTableDialogBuilder”

I get the error when running the script below (and others) from Script Editor, but not Script Debugger. (Also errors in osascript, which is how I first encountered it).

I know this script as is has run in the past in SE (not sure about osascript).

→ Mac OS: 26.4.1 (25E253)
→ Script Debugger 8.0.10 (8A88)
→ Script Editor 2.11 (234)
→ AppleScript 2.8

Could it be a tahoe thing?

use AppleScript version "2.4"
use framework "Foundation"
use framework "AppKit"
use script "Myriad Tables Lib" version "1.0.9"
use scripting additions

property theCheckbox : missing value
property thePopup : missing value
property theAccessoryView : missing value

set popupList to {"Fred", "Frieda", "George", "Georgina"}
-- Manipulation of views should be done on the main thread
if current application's NSThread's isMainThread() as boolean then
	my createCheckBoxMainThread:{"Check me", "checkboxClicked:"}
	my createPopupMainThread:{popupList, "Georgina"}
	my buildAccessoryViewMainThread:{theCheckbox, thePopup}
else
	my performSelectorOnMainThread:"createCheckBoxMainThread:" withObject:{"Check me", "checkboxClicked:"} waitUntilDone:true
	my performSelectorOnMainThread:"createPopupMainThread:" withObject:{popupList, "Georgina"} waitUntilDone:true
	my performSelectorOnMainThread:"buildAccessoryViewMainThread:" withObject:{theCheckbox, thePopup} waitUntilDone:true
end if

-- make a table and add the accessory view
set theTable to make new table with data {¬
	("One"), ¬
	("Two"), ¬
	("Three"), ¬
	("Four"), ¬
	("Five") ¬
		}
modify table theTable accessory view theAccessoryView
set theAccessoryView to missing value -- to avoid error messages when saving
display table theTable
-- get the state of the checkbox
set theState to theCheckbox's state() as boolean
set theCheckbox to missing value -- to avoid error messages when saving
set theValue to thePopup's title() as text
set thePopup to missing value
display dialog theValue

on createCheckBoxMainThread:theArg
	set {theTitle, theAction} to theArg as list
	-- build a checkbox
	set my theCheckbox to current application's NSButton's alloc()'s initWithFrame:{{10, 10}, {150, 18}}
	tell theCheckbox
		its setButtonType:(current application's NSSwitchButton)
		its setTitle:theTitle
		its setTarget:me
		its setAction:theAction -- a handler in this script
	end tell
end createCheckBoxMainThread:

on createPopupMainThread:theArg
	set {entryList, defaultValue} to theArg as list
	set my thePopup to current application's NSPopUpButton's alloc()'s initWithFrame:{{10, 35}, {150, 26}} pullsDown:false
	thePopup's addItemsWithTitles:entryList
	thePopup's selectItemWithTitle:defaultValue
end createPopupMainThread:

on buildAccessoryViewMainThread:theControls
	set my theAccessoryView to current application's NSView's alloc()'s initWithFrame:{{0, 0}, {160, 60}}
	repeat with aControl in theControls
		(theAccessoryView's addSubview:aControl)
	end repeat
end buildAccessoryViewMainThread:

-- this is called when the checkbox is clicked
on checkboxClicked:sender
	-- make an alert and show it as a sheet over the table window
	set theWindow to sender's |window|()
	set theAlert to current application's NSAlert's alloc()'s init()
	theAlert's setMessageText:"You clicked the checkbox"
	theAlert's setInformativeText:"Now close this sheet"
	theAlert's beginSheetModalForWindow:theWindow completionHandler:(missing value)
end checkboxClicked:

They stopped allowing Script Editor to load third-party frameworks a while back. Script Debugger has some specific code to deal with it (for other reasons).